A New Jersey man who was hailed a hero for seemingly trying to rescue his neighbor from her burning home is now accused in her murder, according to investigators.

In an unbelievable twist, the Union County Prosecutor’s Office said that a months-long investigation determined a July 25 fire that killed 82-year-old Virginia Cranwell in her Kempershall Terrace home was intentionally set, and the man who lives next door is believed to be the killer.

Over the summer, police and fire units in Fanwood responded to a 911 call about a house fire just after 1:30 a.m. First responders found the Cranwell inside the home, and she was pronounced dead shortly after. The county medical examiner later ruled the death a homicide.

While her neighbor, 70-year-old William Ahle, was initially believed to have tried to help Cranwell, he was arrested and charged Thursday in her murder. He also faces first-degree burglary and second-degree aggravated arson charges as well. Attorney information for Ahle was not immediately available.

In July, Ahle’s son described his father’s supposed heroics.

“He just looked, saw the flames, went in. He apparently opened the bedroom door and all the flames just burst out, he fell backwards and I guess that’s how he got all his burns,” Matthew Ahle said in the immediate aftermath of the fire. “I’m happy he tried, he tried his best. I can’t imagine anyone else who would do that.”

The senior Ahle was briefly hospitalized with second-degree burns as a result of the fire.

His son said his father was so well-known and liked in the neighborhood, he was the “street mayor.” calls to Ahle’s son and wife by phone were not returned. There was no answer at the family’s door.

Many neighbors did not wish to speak about the arrest, and those who would talk did not want to be identified.

“Since the fire, you know, we all just thought he was a hero,” one neighbor said. “I feel bad for the family, I really do like them.”

Prosecutors have not shared a motive for the alleged killing. Ahle was being held at the Middlesex County jail pending his next court appearance.