UPDATE: Madison County authorities are reporting that Kirsten died in an ATV accident near Rocks Road & Parrot Drive in Whitehall.

Kirsten Ryerson, 21, has been missing from Whitehall, Montana, since last Thursday, June 22nd. If you have any information regarding here whereabouts, please contact the Jefferson County Sheriff's Office. She was last seen at the Mint Bar in Whitehall wearing a purple t-shirt & jeans.

She was driving a 2016 Red Yamaha four-wheeler with plate: YFM700ATV.  Kirsten is developmentally disabled & it is reportedly very out of character for her to not contact family or friends.

Kirsten is 5'7", 150 pounds with blue eyes.

The number for the Jefferson County Sheriff's Office is 406-225-4075.