Police have been searching for Kenneth Konias Jr., 22, since the Tuesday afternoon death of his co-worker, Michael Haines, 31.
"He had at least a two-hour head start from the time he left work until the time Mr. Haines was discovered," Cmd. Tom Stangrecki of the Pittsburgh Police Department said. "We're not sure if he's in the state."
The FBI is assisting the Pittsburgh Police Department in the search for Konias, Stangrecki said.
The two men worked for Garda Cash Logistics and were collecting cash from the Rivers Casino and a Home Depot in Pittsburgh.
Haines' roommate of seven years, Joe Krsul, told ABCNews.com his friend and Konias worked together "a couple of times a week". Haines never expressed concern about Konias, but said he preferred working with the veteran guards.
"He said he felt the younger gyus didn't know what they were doing," Krsul said.
Slumped over with a gunshot wound to the back of the head, Haines' body was found in the idling armored truck two hours after police believe Konias shot him to death. At least $2.3 million was missing from the truck.
He fled the scene but made a phone call to a friend, which was outlined in the criminal complaint charging him with homicide and robbery.
Read more: abcnews
