Police have arrested a man wanted for allegedly setting an ex-girlfriend's car on fire in Brooklyn in October. That man also happens to be the ex-boyfriend of a rookie Correction officer who was fatally shot while she sat in her car.

Investigators were interested in talking to Keon Richmond, 34, about the killing of Alastasia Bryan, 25, who was off-duty when she was found dead in her car at East 73rd Street and Avenue L in the Flatlands section of Brooklyn, on December 4th around 9:15 p.m.

NYPD Chief of Detectives Robert Boyce said that she had left her mother's house to make a phone call when the shooter walked up to the car, a new Infiniti, and fired five times.

The shooter then fled west on Avenue L and got into what the police say is a gold or tan colored 4-door Hyundai Elantra.

The shooter and another individual (video) are described as males in dark colored clothing.

Sources told DNAinfo that Richmond was upset at Bryan for asking for her car back: Bryan had recently "broken up with her boyfriend and demanded that he return her 2010 BMW, which she apparently turned in to get the new Infiniti. 'The guy was really pissed about her asking for the car back,' a source said, speculating that the request coupled with the breakup fueled his desire for revenge."

When Richmond refused to return the car, Bryan had apparently reported it stolen.

The New York-New Jersey Regional Fugitive Task Force found Richmond, a gang member with dozens of arrests and a history of terrorizing girlfriends, hiding in a closet in a Flatlands apartment.

He has not been charged in Bryan's murder, just the arson.

Anyone with information in regards to this incident is asked to call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782). The public can also submit their tips by logging onto the Crime Stoppers website at WWW.NYPDCRIMESTOPPERS.COM or by texting their tips to 274637 (CRIMES) then enter TIP577. There is a $20,000 reward.