Updated

The Latest on the slaying of an 86-year-old California woman (all times local):

10:45 a.m.

Authorities have arrested an 18-year-old man accused in the death of an 86-year-old California woman who was sexually assaulted and beaten during a morning walk.

Sacramento Sheriff's Department spokesman Sgt. Tony Turnbull on Friday identified the suspect arrested as Neven Glen Butle.

He became a suspect in the slaying of 86-year-old Fusako Petrus after his arrest on unrelated assault and elder abuse charges stemming a separate attack on Wednesday. That's the same day Petrus died.

Turnbull says homicide detectives tied Butler to the scene of the earlier sexual assaults of Petrus and a 61-year-old friend.

He says Butler is being held on suspicion of murder.

He is set to be arraigned in Sacramento Superior Court on Monday.

Turnbull says Petrus was killed after she tried to help her friend who was the initial target of the attack.

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8:25 a.m.

An 86-year-old California woman who was sexually assaulted and beaten to death during a morning walk around a high school track hit the attacker with her walking stick to try to fend off the man.

Authorities say Fusako Petrus was killed when she came to the aid of a 61-year-old friend who was the initial target of the attack Wednesday as they exercised on the track near Sacramento.

KCRA reports (http://bit.ly/2ppl2dB ) that family friend Vicki Butler says the man was choking the younger woman when Fusako started hitting him with her walking stick. This allowed the friend to get away.

Police say a man was arrested later Wednesday in connection with a separate assault several miles away. Investigators say he is a person of interest in the homicide, but he has not been charged.