Sheriff's spokeswoman Lisa Bowman says deputies responded to calls of shots fired near Antelope Road at about 2:15 a.m.
They confronted the man they found carrying an assault rifle, and ordered him to drop the weapon, but he refused. She says the deputies shot him when he then pulled out a handgun and pointed it at them.
The victim was taken to the hospital, where he was pronounced dead. Authorities have not released his name, pending notification of next of kin, but described him as a male in his late 20s.
The deputies have been placed on administrative leave and the shooting is being internally investigated.
There were two incidents of officer-involved shootings reported over the weekend. In Citrus Heights, authorities said a woman was shot and killed after she rammed a stolen car into two patrol cars.
The Carmichael man accused of trying to kill his two children back in 2015 is set to be sentenced next month, after pleading guilty to the crimes on Thursday.
The survivors of crime victims spoke out Thursday in Stockton, coming together to tell their stories and honor their loved ones.
Update 11/14/2016, 6:50 p.m.: A Stanislaus County Sheriff Deputy was shot and killed yesterday while checking out a suspicious vehicle near Hughson.
A memorial continues to grow for a Marysville boxing trainer who was shot to death outside of his gym and in front of his eight-year-old son Wednesday.
The Sacramento Police Department is answering for two separate shootings by police officers. Friday the City Manager signed a contract with a credentialed expert to investigate the two incidents.