The shooter, who has not been officially named, had been on a terror watchlist He was flagged to the FBI before he killed elite Texas cop Jorge Pastore Saturday Three others who died were Eman Ahmed El Nemr-Nassar, a mother, Ahmed Mohamed Nassar, 35, her son and Riad Mohamed Nassar, 32, her other son The gunman who shot dead a hero Texas SWAT officer during a hostage situation was on the terror watchlist, DailyMail.com can reveal. The FBI had investigated members of the shooter's family before Saturday's killing of top cop Jorge Pastore, law enforcement sources said. Cops responded to...