NORTH COAST, Calif. — A Silver Alert has been issued for a missing and at-risk Santa Rosa man last seen a week ago.

Lawrence “Larry” Atchison was last seen on foot at Leafwood Circle and Silverwood Street near his home in the Bennett Valley area of Santa Rosa at 4:45 p.m. Monday, Feb. 27.

The California Highway Patrol issued the Silver Alert on behalf of the Santa Rosa Police Department.

He grew up in Lake County and his family is looking to spread the word in areas where he's previously lived.

Atchison is 64 years old. He is 6 feet tall, weighs 200 pounds, has gray hair and brown eyes.

He was last seen wearing a black fleece zip up jacket, blue jeans and black slip on shoes.

Family said he has medical conditions including dementia and Alzheimer's.

A Facebook group has been formed to share information about his case.

Anyone with information is asked to call local law enforcement via 911 or authorities in Sonoma County at 707-528-5222.