Dallas police said the man whom officers fatally shot in a hospital parking garage last week in the Stemmons Corridor area had impersonated law enforcement and used an alias while connecting officers to off-duty security work.
The shooting, the sixth involving Dallas police this year, happened Wednesday evening outside Children’s Medical Center Dallas. Edited body-camera footage released Monday shows fugitive unit officers pursuing the man, identified as Diamon-Mazairre Robinson, 39, through downtown Dallas hours before the confrontation in the parking garage, where SWAT officers used tear gas on his vehicle before fatally shooting him.
Robinson, who police said was wanted on multiple active warrants, some dating to 2017, worked for U.S. Rep. Jasmine Crockett under the alias “Mike King.” Election finance records show the Dallas Democrat’s campaign listed that name for a security services payment in March 2025.
“He was very good at hiding his true identity,” Deputy Chief William Griffith said at a news conference Monday at Jack Evans Police Headquarters. Griffith added that Robinson had maintained the false persona for “many years.”
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Dallas police Deputy Chief William Griffith, foreground, speaks, Monday, March 16, 2026, during a news conference at Dallas Police Department, regarding the officer-involved shooting on March 11 in the Medical District, in Dallas, as Assistant Chief Samuel Sarmiento listens.
Chitose Suzuki / Staff Photographer
After police lost sight of his vehicle in a pursuit earlier in the day, Robinson parked a sedan in the hospital garage, where officers later spent more than an hour trying to persuade him to come out. SWAT officers were then called in and continued the negotiations.
At one point, the video shows, Robinson stood up and raised an arm that police said was holding a handgun, and officers opened fire. He died at the scene despite lifesaving efforts by a SWAT medic, Executive Assistant Chief Terrence Rhodes said.
Court records show Robinson had a number of felony convictions tied to vehicle theft cases in 2011 and 2012. The renewed effort to find him began a week or two ago, Griffith said, after Irving police alerted law enforcement agencies on Feb. 17 to an SUV displaying a stolen license plate from the U.S. Navy.
A Dallas officer recognized the vehicle because he had seen it while working a secondary job Robinson arranged, Griffith said. The officer then alerted investigators in the department’s intelligence unit.
A search of Robinson’s home and vehicles in his possession turned up fake identifying information for law enforcement agencies, Griffith said, including one purportedly issued by the “Special Dignitary Police” — an agency that does not exist.
Allison Hudson, a police spokesperson, said Robinson had used fictitious information to portray himself as a federal agent and at times wore “police-style uniforms.”
Under department policy, police said, three officers involved in the shooting were placed on administrative leave: Senior Cpl. Jeremy Borchardt, who joined the department in August 1999; Senior Cpl. Matthew Chatman, who joined in November 2009; and Senior Cpl. Raul Diaz, who joined in January 2017.
The shooting remained under investigation by the Dallas County district attorney’s office and the department’s special investigations unit.
Hudson said later briefings could be held to discuss other elements of the investigation.
Work with congresswoman
The name “Mike King” appears on state business records tied to Off Duty Police Services, a company listing a Dallas post office box as its address.
The name also appears on federal campaign finance disclosures for Crockett’s campaign, which show a $340 payment for security services in March 2025, just weeks after the company was incorporated. The filing lists the same post office box.
The extent of Robinson’s work for Crockett was not immediately clear. Reached by The Dallas Morning News on Thursday, a Crockett spokesperson, Karrol Rimal, declined to comment on the shooting and said, “We’re just waiting to get more information about the entirety of this situation.”
Congressman Jasmine Crockett spoke to her supporters during an election night watch party at Club Vivo in downtown Dallas, March 3, 2026. Crockett, who is running for US Senate against State Rep. James Talarico, spoke about the Texas Supreme Court decision to shut down the Dallas County polls after they stayed open.
Tom Fox / Staff Photographer
After the police news conference on Monday, Crockett’s campaign issued a statement on social media saying it was “saddened and shocked” by what had emerged about the man they knew as Mike King and had been “in and around our team for years.”
The statement, which refers to Robinson by his alias, said the episode exposed gaps in the security systems protecting members of Congress. The campaign said it had followed House protocols in hiring additional security and had been approved to use the vendor, which it said worked closely with law enforcement agencies, including the Capitol Police.
“This situation reiterates the need for Capitol Police to provide security for members of Congress, especially under this administration’s new normal of inciting attacks on those who dare to speak out,” Crockett’s statement reads. “We are fortunate that this is someone who used those loopholes without malice.”
The campaign said Robinson “never endangered our team, worked diligently, coordinated with local law enforcement and maintained positive relationships throughout the community.” It also invoked Crockett’s background as a former public defender, saying she has long believed that people are capable of redemption and deserve second chances.
“His death evokes a range of emotions,” the statement reads. “Our hearts grieve the loss of someone we knew and the lost good that could have come from his redemption.”
Crockett lost this month’s Democratic primary for U.S. Senate to state Rep. James Talarico of Austin in a closely watched race that split Democrats over how to compete in a state the party has not won statewide in decades.
Work with off-duty officers
Using his alias, police said, Robinson created a profile on RollKall, an Irving-based company whose online platform helps officers find and manage off-duty work. The company’s website says the platform is used by more than 2,000 law enforcement agencies in 39 states.
RollKall announced its partnership with the Dallas police in April 2024 after the Dallas City Council approved a contract for the company’s secondary job management system.
The department has since incorporated the platform into its general orders, which say that secondary jobs should be routed through the application.
Dallas police respond to a scene in the 4300 block of Woodhollow Drive on Monday, Feb. 2, 2026, in Dallas.
Smiley N. Pool / Staff Photographer
Robinson had been using RollKall as early as April 2025, Hudson said. He created a profile using his Off Duty Police Services company, which appeared to be a legitimate business on the Texas Secretary of State’s website, she added.
Chris White, a co-founder and managing partner of RollKall, declined to answer questions about the case when reached by phone Friday.
In a statement, the company said Robinson was not “able to access or disseminate the personal data or personally identifiable information of any other person on the platform.”
RollKall’s statement went on to say the company would work with Dallas police and any other law enforcement agencies as needed as part of the investigation.
Hudson, the police spokesperson, said the company was taking steps to contact some clients who may have interacted with Robinson.