Authorities say an off-duty New York state parole officer who was fatally shot inside her apartment by a police detective had fired first.

State police officials conducting the investigation into the Oct. 4 shooting in Canandaigua said Friday that 48-year-old Sandy Guardiola was lying in her bed when Detective Sgt. Scott Kadien checked on her at the request of another parole officer.

Officials say Kadien spoke to her briefly and left the bedroom to summon help. When he re-entered the room, she was holding a handgun.

Police say Kadien retreated and told her not to shoot. Officials say Guardiola fired once, hitting a wall. Officials say he ordered her to drop the gun, but when she raised it again he fired, hitting her three times.