William Williams and Richard Cromwell were identified by witnesses and video surveillance from the scene of last month’s killing, prosecutors said. Williams is accused of firing the fatal shot during a scuffle.

DJ Megatron was shot once in the chest while walking to a store near his Staten Island home on March 27.

The 32-year-old disc jockey, whose given name was Corey McGriff, worked on BET’s “106 & Park” music countdown series, mainly in a role interacting with its live audience. He also did on-camera work for the show and BET’s website.

Williams, 21, and Cromwell, 20, were arrested Wednesday on charges of murder, robbery and criminal possession of a weapon.

Williams’ lawyer, Mario Gallucci, said the case was a tragedy.

“It’s a shame that such a rising star lost his life in such a tragic way,” Gallucci said. “But we ask you, the public, not to rush to judgment about my client.”

Cromwell’s attorney didn’t immediately return a telephone call seeking comment Thursday.

Police initially said they didn’t believe the DJ’s shooting death involved a robbery because nothing appeared to have been stolen from his body. Prosecutors said Thursday that Williams and Cromwell had stolen his wristwatch.

DJ Megatron rose to the on-air ranks after starting as an intern. He began his career at New York’s WKRS-FM, better known as Kiss FM. He also worked at what was then Boston’s Hot 97.7, or WBOT-FM, and at Philadelphia’s The Beat, or WPHI-FM, according to a bio on his MySpace site.

He was a father of three and devoted time to charitable events on Staten Island, his manager said.