A suspect in the Hillcrest Heights jewelry store robbery that resulted in the death of an off-duty Prince George's County police officer last Monday turned himself over to FBI agents yesterday.

Mandel Robert Cooper surrendered to the agents at an address on Quincy Street NW at 2:18 p.m. Cooper was arrested on a federal warrant for unlawful flight to avoid prosecution sworn out earlier this week, said agents of the Washington field office of the FBI.

"Apparently the word got out on the street that he was named on the warrant," said FBI spokesman Dick Marquise. "He made some arrangements through family and friends to surrender to us."

Cooper is suspected of being one of three gunmen who robbed a Kay Jewelers store in Iverson Mall on Monday. Officer Raymond Hubbard, who tried to stop the robbers, was caught in a fatal crossfire as the men escaped.

Only federal flight charges have been lodged against Cooper, who has been given over to the custody of Washington police until Tuesday, Marquise said. At that time, the federal charges will probably be dropped in favor of Maryland armed robbery charges, Marquise said.

Prince George's police officials would not comment on the arrest.