ORLANDO, Fla., May 21 (UPI) -- Orange County authorities have identified a man found dead Wednesday in a vacant lot, and say the murder victim was no stranger to violence. The body was identified as that of 31-year-old Derrick Johnson, who until seven months ago was serving time in a state prison for the murder of an Orlando teenager. Investigators say Johnson died from gunshot wounds, and nearby residents reported hearing gunfire followed by the sounds of two men talking. No suspects have been arrested in the slaying. Five years before his murder conviction, Johnson -- then 21 years of age -- was shot in the back during a gang fight in Orlando. -=-=- 