A city inmate accused of shooting two police detectives to death as they drove him to jail was convicted of their murders Monday.
Prosecutors charged that Jay "Stoney" Harrison took a gun from a police squad-room locker in Queens Borough Hall and used it to shoot the officers as they drove him to the Rikers Island jail Nov. 13.
Police sources later said the officers apparently had failed to follow procedures for handling inmates.
"This was more than murder -- it was an execution," Queens District Attorney John J. Santucci said after the verdict at state Supreme Court in Queens. He said he would seek the maximum term, 63 years to life in prison.
Killed in the shooting were Detectives Richard Guerzon, 46, and Keith Williams, 34. They were transporting Harrison after he met with lawyers on another murder charge, for which he has yet to be tried.
Harrison, 25, had been handcuffed by one hand to a pipe on a table in the squad room. While briefly unguarded, he apparently managed to reach into a police locker that had a defective lock and remove a handgun.
In the back seat of the officer's car, with his hands handcuffed in front of him, he drew the gun and shot the officers as they drove back to Rikers, prosecutors said.
Authorities later said the prisoner should not have been unguarded in the squad room and should have had his hands cuffed behind his back in the car.