Kevon Darnell Neal, 23, of Fort Washington, turned himself into police Thursday night.
Police said he was driving the stolen Acura involved in the police chase and crash that killed Officer Adrian Morris on Monday.
Another suspect, 24-year-old Kenneth Clark Mitchell Jr., of the District, was arrested early Tuesday morning.
The two men are accused of stealing a car from a gas station in Laurel Monday afternoon. Police said that Morris chased after the men, who sped down Interstate 95 in Laurel and Beltsville, crossing all lanes of traffic as they drove.
In the course of the pursuit, the officer’s cruiser left the roadway and flipped several times. Morris, who was not wearing a seatbelt, was ejected from his vehicle and died from his injuries.
Neal and Mitchell both face felony theft charges in connection with the crash.
Prince George’s County police announced that they will hold a news conference at 1 p.m. Friday with more information about Neal’s arrest.