The automobile in which Lawrence W. Fishman was seen last Friday driving away from the home in Silver Spring where his father lay fatally wounded has been found by police in Richmond, parked in a city lot near the Trailways bus terminal.

Fishman, a 29-year-old Phi Beta Kappa lawyer, is being sought by Montgomery County police in murder and assault charges stemming from the Friday incident at his parents' house. His 60-year-old father, Frederick, a law judge with the U.S. Interior Department, was fatally shot and his mother Evelyn, also 60, was wounded in the neck.

"We're concentrating our investigation in the Richmond area," said Montgomery police spokesman Phillip Caswell yesterday. He added that authorities have yet to recover the gun involved in the slaying, or establish a motive.

Richmond police said the car, a silver-blue Oldsmobile rented from an agency in Peabody, Mass., had been illegally parked for at least two days in a city lot at 9th and Marshall streets, next to the bus terminal. The car was ticketed Monday and Tuesday before police impounded it, according to Det. Sgt. Norman A. Harding.

"There was nothing in the car," Harding said. "It's an educated guess that he got on a bus. But he could still be right here in Richmond." Harding said detectives concluded that the fugitive had not used a credit card at the bus terminal.

Montgomery police had been searching Fishman's old haunts in Philadelphia where he lived in the 3400 block of Spruce Street. According to a family friend, the young lawyer had been admitted to the bar in Pennsylvania after failing several times to pass the bar in California.

The death of Frederick Fishman left many of the judge's colleagues and friends confounded and numb. It was not the first time calamity had struck the Fishman family. Lawrence's elder brother Richard was killed in a terrorist bombing on a visit to Israel 12 years ago.

More than 300 persons attended the funeral service held Monday for the slain judge, described by colleagues as a man "who put his children's welfare above everything else." Fishman, a Harvard graduate, was an intellectual given to sayings in Latin and Yiddish. He had a 40-year career with the Interior Department and was planning to retire in January.

He was buried at the King David Memorial Garden in Falls Church.