BOISE, Idaho \u2013 For nearly 40 years, two of America\u2019s most haunting unsolved mysteries ran on separate tracks. One was a man with no name who died in a Boise church. The other was a faceless killer who terrorized the nation by lacing Tylenol capsules with cyanide.<\/p>\n
On Wednesday, Ada County Sheriff\u2019s Office officials announced those two tracks may have always been the same road.<\/p>\n
The man known as the \u201cUnknown Wanderer\u201d \u2014 who died of cyanide poisoning inside Sacred Heart Catholic Church in Boise on Dec. 4, 1982 \u2014 has been identified as Dr. Mathew Francis Betkowski, an organic chemist with a documented history of mental illness, a deep fascination with cyanide and a trail that connects Jacksonville, Florida, to the Chicago suburbs where seven people died after taking poisoned Tylenol capsules just weeks before Betkowski turned up dead in Idaho.<\/p>\n
The Tylenol murders: America\u2019s most infamous unsolved poisoning<\/p>\n
In late September 1982, seven people in the Chicago area died after taking Tylenol capsules that had been laced with potassium cyanide. The victims included a 12-year-old girl. The case sparked a nationwide panic, forever changed the way consumer products are packaged and has never been officially solved.<\/p>\n
For more than four decades, the identity of the Tylenol killer has remained one of the most pursued \u2014 and most elusive \u2014 answers in American criminal history.<\/p>\n
Ada County Sheriff Matt Clifford said Wednesday that his office believes it may have finally found that answer \u2014 and that the answer begins with a key.<\/p>\n
Decades in an evidence room<\/p>\n
When Betkowski walked into Sacred Heart Church on the evening of Dec. 4, 1982, he carried two key rings with nearly 30 keys, a wallet with no cards, and an envelope containing 19 $100 bills and a typed note signed with a fake name. He had no identification. His fingerprints matched nothing on file locally or with the FBI.<\/p>\n
For decades, those keys sat in an evidence room \u2014 holding a secret no one could read.<\/p>\n
Ada County Sheriff\u2019s Office Det. Tim Cooper reopened the case in 2019 after being approached in a parking lot by a member of Sacred Heart Church who expressed interest in the long-cold investigation. He cross-referenced the case file against more than 17,000 missing persons records. No one had ever reported the Unknown Wanderer missing.<\/p>\n
Then he picked up a magnifying lens.<\/p>\n
The key, the hallmark, the street<\/p>\n
Using a magnifying lens and the help of local key experts in Boise, Cooper and his team identified a hallmark stamped on one of the keys that traced back to a hardware store in Jacksonville, Florida. A separate etching on the keys \u2014 previously misidentified by investigators, though Cooper noted it was \u201ca close misidentification\u201d \u2014 appeared to reference a specific street in Jacksonville called Mills Court.<\/p>\n
\u201cThere\u2019s the key,\u201d Cooper said at Wednesday\u2019s press conference, holding it up. \u201cHere it says Mills Court, and that\u2019s what led us to that particular street.\u201d<\/p>\n
The hardware store had been owned by a couple of former law enforcement deputies. When Cooper contacted them, they connected him directly with cold case detectives in Jacksonville \u2014 opening an investigative path that would eventually span multiple states and four decades.<\/p>\n
\u201cThere\u2019s just been no shortage of support from detectives all over the country,\u201d Cooper said. <\/p>\n
Property deeds, a name, a brother<\/p>\n
Working with investigators and records personnel in Jacksonville, the Ada County Sheriff\u2019s Office obtained property deeds from Mills Court dating to the late 1970s and early 1980s. Cooper\u2019s team attempted to locate every person whose name appeared on those deeds.<\/p>\n
One name stood out.<\/p>\n
The records listed a man whose death had been recorded in 1989 \u2014 meaning he had still been alive in 1982. Investigators tracked down his sole surviving immediate family member: a brother living in the Los Angeles area.<\/p>\n
When Cooper contacted the man, he learned that his brother had lived in Jacksonville, had gone missing in 1982 and had been legally declared deceased in absentia \u2014 meaning a court had ruled him dead without a body ever being found \u2014 in 1989.<\/p>\n
A DNA sample was collected from the Los Angeles man and analyzed against DNA obtained from the Unknown Wanderer\u2019s wallet. The results showed the two men shared the same father with very high probability.<\/p>\n
The Sheriff\u2019s Office said it confirmed the Unknown Wanderer was Dr. Mathew Francis Betkowski. <\/p>\n
Connection to Jacksonville<\/p>\n
Betkowski\u2019s connection to Jacksonville ran deeper than a hardware store key. It was there, in the mid-to-late 1970s, that the clearest early warning signs of what was to come began to surface, according to investigators. <\/p>\n
After earning a Ph.D. in organic chemistry, Betkowski worked for a flavors and fragrances company in the Jacksonville area beginning around 1975. Coworkers grew alarmed. They reported Betkowski discussing \u201cthe perfect crime\u201d and suggesting that cyanide could be used as \u201ca less messy means of taking one\u2019s life.\u201d He was observed talking to himself and expressed fears that he was being tracked.<\/p>\n
Those who knew him tried to get him help. Betkowski received roughly two and a half months of outpatient and inpatient psychiatric treatment at the UCLA Neuropsychiatric Institute in Los Angeles in 1978. When he returned to Florida, his employer determined his condition had not sufficiently improved and terminated his employment.<\/p>\n
In 1979, Betkowski lost his mother and received additional psychiatric treatment at a state hospital in Florida. It was during this period that he wrote about managing schizophrenia and depression \u2014 and about the possibility that imaginary thoughts of violence could produce feelings of euphoria.<\/p>\n
From Florida to New Mexico \u2014 and a cascade of losses<\/p>\n
After leaving Florida, Betkowski was hired by Lockheed in late 1979 and worked on a NASA-related project at the White Sands Test Facility in New Mexico. That employment ended in March 1982, following a reported disturbance at a local pharmacy in the Las Cruces area \u2014 where Betkowski allegedly requested pills or capsules, saying they were \u201cfor an experiment\u201d \u2014 and the discovery that he had been removing unauthorized materials from the lab.<\/p>\n
Investigators say they also learned that the Las Cruces Police Department had an unsolved cyanide poisoning death from May 1982 \u2014 months before the Tylenol murders. The victim had capsulized medication, though none was tested and evidence has since been purged. Cooper said Betkowski is not being named as a suspect in that case, but the death drew investigators\u2019 attention given how rare cyanide-related deaths were in the U.S. at that time.<\/p>\n
\u201cIn fact, in the following years, I believe our stats from the CDC indicate single-digit numbers,\u201d Cooper said, \u201cso not a common way to die.\u201d<\/p>\n
A little more than a month after his termination from White Sands, Betkowski\u2019s father died. Writings from 1980 and 1981 show Betkowski had expressed interest in visiting Chicago, noting he had never really been there. Photos discovered in 2024 confirmed he did visit the Chicago area \u2014 though subsequent investigation determined those photos were likely taken in December 1981, not 1982.<\/p>\n
\u201cAt this time, it\u2019s unclear if Dr. Betkowski returned to Chicago in 1982, and we cannot place him in Chicago in the final week of September 1982,\u201d Cooper said.<\/p>\n
The road to Boise<\/p>\n
On Oct. 15, 1982 \u2014 roughly two weeks after the last of the seven Tylenol deaths in the Chicago area \u2014 Betkowski left his Las Cruces residence for the last time. He is believed to have sold his car near the border in Brownsville, Texas.<\/p>\n
Seven weeks later, he was dead in Boise \u2014 his hair dyed, his appearance deliberately altered, carrying a fake name and nearly $2,000 in cash.<\/p>\n
\u201cIt\u2019s believed that Dr. Betkowski took intentional steps to conceal his identity, his cause of death, and the reason for his death,\u201d Cooper said.<\/p>\n
The cyanide found in Betkowski\u2019s childhood bedroom in Los Angeles after his brother\u2019s death in 2021 was sodium cyanide \u2014 not potassium cyanide, which was used in the Chicago Tylenol deaths. Testing confirmed it was not consistent with the Tylenol case cyanide. But investigators noted that a small bottle with a handwritten label, peach pits and apricot seeds found alongside it suggested the cyanide was likely homemade.<\/p>\n
A forensic psychiatrist connects the dots<\/p>\n
Dr. Park Dietz, a forensic psychiatrist who has consulted on cases involving Jeffrey Dahmer, Ted Kaczynski and the D.C. sniper attacks, reviewed Cooper\u2019s investigation and offered a pointed assessment.<\/p>\n
\u201cThe information developed about Dr. Betkowski is extraordinary,\u201d Dietz said. \u201cHis interest in cyanide, his access to cyanide, his comments about cyanide, his interest in explosives \u2014 these two phenomena have in common the ability to conduct violence against multiple victims simultaneously in a manner that allows the killer to escape undetected.\u201d<\/p>\n
Dietz said Betkowski fit the profile of what he termed a \u201cset and run\u201d killer \u2014 someone capable of carrying out mass violence and disappearing without detection. He said the convergence of Betkowski\u2019s untreated paranoia, substance use and a cascade of personal losses created a dangerous picture.<\/p>\n
To test his assessment, Dietz said he presented Betkowski\u2019s case anonymously to three separate professional groups \u2014 without identifying Betkowski or even mentioning Boise.<\/p>\n
\u201cOverwhelmingly, they regarded him as a viable suspect,\u201d Dietz said of the forensic psychiatrists. At a subsequent presentation to criminal profilers at the FBI Academy, he said, \u201ceveryone agreed this was a viable suspect and even more were as convinced as I that Detective Cooper had solved the most important unsolved murder of my lifetime, the Chicago Tylenol murders.\u201d<\/p>\n
Dietz was careful to note that mental illness alone does not cause violence.<\/p>\n
\u201cIt is not associated with a higher risk of violence,\u201d he said, \u201cbut when someone remains untreated for paranoid delusional ideas and also abuses substances, they put themselves in a higher risk category for future violence.\u201d<\/p>\n
Not a suspect \u2014 but not ruled out<\/p>\n
Sheriff Clifford and Cooper both emphasized that Betkowski has not been officially named a suspect in the Tylenol murders. The case remains with law enforcement agencies in the Chicago area, including the Arlington Heights Police Department, which holds three of the seven cases and a significant amount of evidence.<\/p>\n
\u201cWe\u2019ve sent all our information over to the Chicago area,\u201d Clifford said. \u201cIt\u2019s not our job to name him as a suspect. This is not an Idaho case.\u201d<\/p>\n
Cooper was direct about the limits of what investigators can prove \u2014 and what they cannot dismiss.<\/p>\n
\u201cI cannot put his shoes in a pharmacy store aisle 44 years ago,\u201d Cooper said, \u201cbut I also can\u2019t dismiss his statements, his actions, his changing his appearance, going to the border, coming here \u2014 because I can\u2019t find a store receipt or something like that. So it\u2019s all created some cause for concern, and that\u2019s really what we\u2019re reporting here today.\u201d<\/p>\n
Tips still needed<\/p>\n
While the identification of Betkowski closes one chapter, investigators say many questions remain. Cooper said the office is seeking information about Betkowski\u2019s movements between Oct. 15 and Dec. 4, 1982, as well as any cold cases involving cyanide poisoning or suspicious medication-related deaths from the late 1970s and early 1980s in the states where Betkowski lived: California, Texas, New Mexico, Ohio and Florida.<\/p>\n
The case is set to be featured in a new \u201cUnsolved Mysteries\u201d documentary titled \u201cUnmasking the Tylenol Killer,\u201d streaming Oct. 9 on the Roku Channel.<\/p>\n