A city police officer whose actions in a homicide case are under investigation has notified department officials of his intention to retire.

Talib Kevin Ghafoor, a longtime narcotics investigator, yesterday resigned and submitted an application for retirement benefits, department officials said. The police pension board will review his application at its meeting today.

Mr. Ghafoor last week was placed on modified duty with pay and was reassigned from street duty to the central records and reporting unit. The city Office of Municipal Investigations and Allegheny County District Attorney Stephen A. Zappala Jr.'s office launched separate investigations as a result of Mr. Ghafoor's contradictory testimony during a Sept. 29 hearing.

The hearing concerned evidence in the drive-by slaying of high school student James Stubbs, 17, near Westinghouse High School in 2006. A trial for the two men charged in that case, Joseph Hall, 19, of Penn Hills, and Lamont Hall, 20, of East Liberty, is set to begin Tuesday. The two men are not related.

During the hearing, Mr. Ghafoor, a friend of Joseph Hall's family, initially testified that he did not communicate with Joseph Hall in the county jail. But after multiple tape recordings of calls were played in court, Mr. Ghafoor acknowledged that he had spoken to Joseph Hall several times, and was "aligned with both defendants.''

Police spokeswoman Diane Richard yesterday said the city internal investigation continues despite Mr. Ghafoor's resignation. The investigation by Mr. Zappala's office also is still underway, spokesman Mike Manko said.

Mr. Ghafoor joined the police bureau in 1987. He was named an Officer of the Year in 1999.