New York City ? Detectives looking for a man who butchered a Manhattan psychologist expanded their investigation to Pennsylvania on Thursday, interviewing a man who spoke to the victim in the days before the killing about his personal problems.

The man was not considered a suspect, and was released after several hours. Authorities also were analyzing surveillance videotape, studying DNA from the crime scene and checking bloody prints left on the basement door of the building where the killer escaped into the night.

The man interviewed in Pennsylvania met therapist Kathryn Faughey, 56, at a guitar camp several years ago with her husband, according to a law enforcement official who spoke on condition of anonymity because the investigation is ongoing.

Questioning stopped after he asked for a lawyer, the official said.

The killer slashed Faughey 15 times with a meat cleaver and a 9-inch knife at her office Tuesday.