The driver of the stolen car involved in a head-on collision that killed an Arlington man after a police chase late Wednesday had traces of amphetamines, cocaine and PCP in his bloodstream, according to an affidavit in Arlington Circuit Court filed yesterday.

The car had been stolen at gunpoint less than an hour before the crash from a couple who had stopped for gasoline at a southern Prince George's County service station, Prince George's police said.

Killed in the crash on Jefferson Davis Highway near the Pentagon was Donald F. O'Connor, 33, of North Arlington. O'Connor's wife, Donna O'Connor, said yesterday she was talking with her husband on his cellular telephone at the instant of the crash.

"He had a speakerphone {which means he could talk without holding a handset to his ear}, and I was talking to him," Donna O'Connor said. "I heard a loud noise that sounded like a crash, and the line went dead. When I tried to call back, I got an {out-of-service} recording."

The stolen car, a 1987 Ford Taurus, was traveling south in the northbound lanes of divided Jefferson Davis Highway (Route 110) when it collided with O'Connor's 1989 Honda Accord about 11:30 p.m.

A third vehicle, a 1987 Dodge truck, then crashed into the rear of O'Connor's car. It was driven by Thomas Jeffries, of Falls Church, who was not injured.

The driver of the stolen car has been identified by police as Michael Gray, 28, of Southeast Washington. Gray remained in stable condition yesterday at National Hospital for Orthopaedics and Rehabilitation with injuries to his face and left leg.

Gray has not been charged, but according to warrants issued Thursday, he is being investigated by Arlington officials for manslaughter, reckless driving and driving under the influence.

Prince George's police said the car Gray was driving was stolen about 10:40 p.m. Wednesday. The driver of the car pulled into a service station, got out to pump gas and encountered two men, one armed with a revolver. They took the driver's money and keys, ordered the passenger out of the car and drove off, police said.

The car was spotted later by D.C. police in Georgetown, who tried to stop it on Key Bridge, which connects Arlington and Georgetown. When the car did not stop, a D.C. cruiser pursued it into Virginia before breaking off the chase and asking that Arlington officials be notified. Arlington police said the call from D.C. police came at 11:27 p.m.; the fatal collision occurred about three minutes later.

D.C. police may continue pursuits into Virginia if there is reason to believe a felony has been committed. D.C. police would not discuss the incident yesterday.

If Gray is identified as one of the armed robbers, Prince George's police will issue a warrant for him in that crime, said Sgt. Bruce Elliott, a Prince George's police spokesman. No gun was found in the car or at the scene of the collision, police said.

Police said they are trying to determine how many people were in the stolen car. They said at least one man was with Gray and that he fled after the crash, stopped a passing car and demanded that the driver hand over his keys. The driver refused, police said, and the man fled on foot.