July 8, 1982 · pg. An actress-model who played the ''little blue nun'' in television wine commercials killed her boyfriend, a transit police officer, with his service revolver during a quarrel yesterday and then fatally shot herself, the police said. The bodies of the model, Catherine Reilly, 28 years old, and the officer, Michael Condon, 34, were found in her apartment at 315 East 54th Street. Dr. Elliot M. Gross, the Chief Medical Examiner, said an autopsy had indicated that Miss Reilly's death was a suicide and Officer Condon's a homicide. Officer Condon, who was separated from his wife, had lived ''on and off'' with Miss Reilly, the police said. They said he had been hit in the right shoulder by a bullet that then entered his chest. Miss Reilly was shot in the face. She had filmed three commercials for Blue Nun wines, according to Michael Finn of the Cunningham & Walsh advertising agency. Michael Amato, Miss Reilly's agent, said she had played a secretary in the film ''Superman'' and had had roles in Off Off Broadway plays and television soap operas. · by: The Associated Press