Authorities in Idaho are looking for a man believed to have killed his pregnant wife and kidnapped their 10-month-old son.

Idaho State Police issued an Amber Alert at 4:30 a.m. Friday after Teton County deputies responded to an open line 911 call and found 38-year-old Kali Jean Randall dead, the Teton County Sheriff’s Office said.

The suspect, 48-year-old Jeremy Albert Best, is believed to have fled the Victor, Idaho, home with his infant son, Zeke Gregory Best, in a black, 1995 Chevrolet Tahoe with Idaho tag number 1T39349.

The Sheriff’s Office said Best was “armed and very dangerous” and described him as 5 feet 11 inches tall and 245 pounds with brown and grey hair and green eyes. The infant weighs about 20 pounds.

Friends of Randall told the Jackson Hole News & Guide that she was pregnant with the couple’s second child.

The Daily also said that Best was found on Thursday walking naked in a Swan Valley store. The Bonneville County Sheriff’s Office said he was taken to Eastern Idaho Regional Medical Center, which confirmed he was released later in the day.

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[Featured image: Kali Jean Randall/Facebook, Zeke Best and Jeremy Best/Teton County Sheriff’s Office]