The Natrona County Sheriff's Office is asking for help in locating a man missing since Monday. According to a Tuesday release from the Sheriff's Office, Jeffrey Heyer, 43, was last seen near Motel 6 in Casper around 6:30 Monday evening. Heyer is described as white, 6 feet tall, weighing 180 pounds, with blonde, thinning hair.

Heyer's vehicle was found Monday night off of Robertson Road around the S-curves spillway, but it's not known if Heyer went into the North Platte River. They have searched along the river in that area.

Anyone who has seen Jeffrey Heyer, or who may have information about where he may be, is asked to call the Natrona County Sheriff's Office at 235-9282.