Sacramento County sheriff's officials said Tuesday that the man fatally shot by a deputy the previous day exhibited "unorthodox behavior" before attacking deputies with "inordinate strength."
The man, identified as 35-year-old Paul Tereshchenko, also did not appear to be affected by a Taser fired by one of the deputies trying to take him into custody on a "5150" a mental health hold.
Sgt. Jason Ramos, sheriff's spokesman, said Tereshchenko had occasionally stayed with relatives at the Nut Plains Drive home where deputies were summoned about 5 p.m. Monday.
One of those relatives called deputies after Tereshchenko allegedly refused to leave when asked to do so, Ramos said.
Two deputies assigned to the Rancho Cordova Police Department under contract with the city arrived at the home and tried to speak with Tereshchenko, but he was incoherent and erratic, Ramos said.
Deputies ultimately decided he qualified for a "5150" hold which refers to the section of state law that allows 72-hour involuntary psychiatric holds because he could not care for himself, Ramos said.
The deputies tried to explain their actions to Tereshchenko, telling him he was not under arrest, but he became "resistive and combative," Ramos said.
With the Taser having no effect on the man, he began to physically fight the deputies. Ramos described Tereshchenko as having a large stature and "inordinate strength," and said he began to overpower the deputies.
Fearing for his safety and the safety of his partner, one of the deputies then fired at Tereshchenko. He rendered aid until paramedics arrived, but Tereshchenko was pronounced dead.
The deputy involved is a 13-year veteran of the department and has been placed on paid administrative leave, according to protocol.
Ramos said Tereshchenko might have had a history of mental illness and drug abuse, based on family members' statements to investigators.
A woman who answered the phone at Tereshchenko's last known address in Turlock hung up on a reporter.
Stanislaus Superior Court records available online indicate Tereshchenko was charged in June 2011 with a felony count of making criminal threats and a misdemeanor count of battery with serious bodily injury. Questions apparently arose about Tereshchenko's mental competency, the online records indicate, and the case ultimately was dismissed last spring.