Hundreds of law officials extended their massive search for a man suspected in a courthouse triple slaying as officials on Saturday tried to determine whether the fatal shooting of a U.S. customs agent was related.

The agent was found dead Saturday, and officials said his blue 1994 Chevrolet pickup (search), pistol and badge were stolen.

The shooting occurred in the same general area where courthouse rampage suspect Brian Nichols used to live.

"We don't know if this is the same suspect," Fulton County Police deputy Chief G.D. Miles said. "Whoever is driving this pickup truck is a cop killer."

Nichols (search), 33, was suspected of killing a judge and two other people at a downtown courthouse Friday, then stealing a reporter's car to escape. But Nichols apparently never took the reporter's green Honda Accord from the parking garage where he carjacked it and attempted more hijackings afterward, police said.