A former Fort Pierce police officer who once worked with 29-year-old Omar Mateen, the assailant in an Orlando nightclub shooting that left at least 50 dead, said he was "unhinged and unstable."
Daniel Gilroy said he worked the 7 a.m. to 3 p.m. shift with G4S Security at the south gate at PGA Village for several months in 2014-15. Mateen took over from him for a 3 to 11 p.m. shift.









