A 26-year-old Northwest Washington man was ordered held without bond yesterday on a charge of second-degree murder in the death of a former girlfriend whose disputed testimony at a 1979 hearing in Montgomery County apparently helped free him of a murder charge he faced there.

David Leander Stratmon Jr., of 7573 Alaska Ave. was arrested at his home Sunday after the body of Stephanie Walker, a 22-year-old Silver Spring woman, was found there.

An autopsy conducted yesterday showed that Walker died of "multiple blunt force injuries," the D.C. medical examiner's office said.

Stratmon had been arrested Jan. 28, 1979, and charged with murder in the death of Claire Levy, a 24-year-old Silver Spring woman who was found strangled in her bed early that morning. Stratmon and Levy were described as friends.

Charges against Stratmon in Levy's death were dropped after a preliminary hearing at which testimony was given by Walker, the victim in Sunday's homicide.

Walker was later charged with perjury in connection with her testimony and was found guilty in November 1979 on four counts of obstruction of justice. She reportedly was given probation in connection with the conviction. No new charges ever were brought against Stratmon in that case.

One of those who testified at Walker's perjury trial was Vivian Levy, 23, of Providence, R. I., the sister of Claire Levy, the woman strangled in Silver Spring in 1979. Only hours after Vivian Levy had testified, her body was found in a motel room in Rockville. The state medical examiner's office ruled that she had died of a drug overdose.

Stratmon, who is unemployed, and Walker, who had been studying data processing, reportedly had been acquainted for about three years.

Walker was "a very nice girl . . . one of the nicest persons I ever met," Stratmon's father said Sunday night. She and Stratmon had a son, who is about 2 years old, the senior Stratmon said.

Investigative sources said yesterday that Walker's injuries were primarily to the head. They said the object with which they were believed inflicted has not been identified. No motive could be learned for the death.

A preliminary hearing for Stratmon is expected Thursday in Superior Court.