PHILADELPHIA – Police say a woman arguing with her boyfriend shot and killed him while he was driving on Tuesday, then allegedly fled the scene of the ensuing crash, reports CBS Philly.

Martina Wescott and Terrell Bruce were driving in a Ford Expedition when Wescott reportedly shot Bruce, causing the SUV to crash into a Subaru in Germantown around 12:30 p.m.

When police and medics arrived, it appeared to just be a bad crash. But medics saw that Bruce had a gunshot wound to his head.

Witnesses told police that a woman got out of the Expedition and ran across the Walnut Lane Bridge.

Police later arrested Wescott. Authorities say she’s facing murder and gun charges.