A video of the Babyshambles frontman allegedly injecting himself with heroin was posted this week on a newspaper Web site. Doherty's drug use has frequently landed him in court.
"Peter sadly relapsed last week and is now looking to check himself back into a rehab clinic so that he can try to continue the hitherto excellent attempts he had made to break free of heroin," his record label, EMI, said in a statement.
"His ongoing rehabilitation was a source of such pride to him that Peter and those closest to him thought that he was close to winning his personal battle with the drug."EMI said Doherty regarded the incident as "a stupid, stupid action for which I feel only shame." He "would like to apologize to the medical staff, fans and well-wishers who have helped and encouraged his progress in fighting his addiction to heroin," the statement said.