sentences:  The FBI investigated his death and declared it a suicide, although the official coroner's report did not label the cause of death as such.A later investigation suggested that Purvis may have shot himself accidentally while trying to extract a tracer bullet jammed in the pistol.Later investigation revealed that the pistol that had taken Purvis's life had once belonged to none other than gangster Gus Winkler; the gun is believed to have been confiscated from Winkler during his debriefing at the Bankers Building in the summer of 1933.