It appears there has been another heroin-related death in Rochester.  Police were called around 1:15 this morning by the roommate of a man who was found dead in the bathroom of their residence.  The name of the man - who is believed to be in his 30s - has not yet been released.   A police spokesman said that the man had a history of drug use and it's suspected the death was a heroin overdose.   An autopsy will be done to determine the cause of death.