D.C. police said yesterday that Samuel M. Tucker, 43, who was slain in his office Tuesday, was not an orthopedic surgeon, as they had believed. "He was not a doctor," a spokesman for the homicide department said. "He was not an orthopedist."

The D.C. Department of Consumer and Regulatory Affairs in 1968 issued Tucker a pharmacy license, which was renewed last March, according to Lucenia Dunn, an aide at the department.

Police said that Tucker had received training at Howard University. But a spokeswoman for the Howard School of Pharmacy said Tucker attended the two-year school from the spring of 1959 to the spring of 1967, but did not receive a degree.

Dunn said no one was available yesterday in the city licensing and certification office who could determine whether Tucker had been granted a degree from another institution. Members of Tucker's family could not be reached for comment.

Tucker's neighbors said he saw patients and was called "doctor." A sign in front of his office read "Tucker Orthopedics."

P. Joseph Sarnella, director of the D.C. Commission on Licensure to Practice the Healing Art, said Tucker was not licensed as a medical doctor in the District.

Police Sgt. Joseph McCann said the investigation is continuing into the shooting deaths of Tucker and Samuel Williams, both of whom were found in Tucker's 13th Street NW office.