New York, NY - Police say an  ex-con blew away a Nassau County cop and an innocent motorist Tuesday during a rampage that ended when he shot himself and was captured after a massive manhunt.

Darrell Fuller, who did five years for a 2004 attempted murder, exchanged a few brief words with Officer Arthur Lopez before blasting the highly decorated officer in the chest, cops said. He was not wearing a bulletproof vest.

The gunman then forced a Brooklyn man off the Cross Island Parkway before pumping a bullet into the terrified victim’s head, cops said.

The shocking double murder near Belmont Park race track on the Nassau-Queens border set off an intense seven-hour search involving hundreds of detectives chasing leads and banging on doors.

Cops found Fuller, 33, around 6:30 p.m. cowering in a stolen van with a gunshot wound — apparently self-inflicted — to the shoulder blocks from his home in St. Albans, Queens.

A 911 call reported a gunshot coming from the vehicle, leading to the arrest.