PITTSFIELD — The car in which three people fled after the fatal shooting of Stephanie Olivieri belonged to Tyler Sumner’s then-girlfriend, a prosecution witness testified Thursday. 

The dark-colored sedan, which Pittsfield police Detective Sgt. Jeff Arena testified was a black 2010 Chevy Malibu, was captured on surveillance footage circling the area of the South John Street and Columbus Avenue in the hours leading up to the shooting. 

Arena