An 86-year-old Californian woman has died trying to fight a man who was allegedly sexually assaulting her 61-year-old friend.
Fusako Petrus was walking with her friend, Arden Arcade, on Wednesday morning (local time) when they were attacked.
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They were on a running track near Highlands High School when 18-year-old Neven Glen Butler allegedly jumped out and attacked Ms Arcade.
Sacramento Sheriff's Sergeant Tony Turnbull says Ms Petrus tried to defend her friend, hitting him with a "small walking stick".
"She died trying to help her friend," he said.
Butler was later arrested after a separate attack on an elderly person that afternoon.
He was being held without bail on charges of murder, felony assault and elder abuse, local authorities said.