His vehicle was found Thursday afternoon in East Windsor, police said.
Police believe McIntosh may wish to harm himself. A Silver Alert was issued for McIntosh on Wednesday, police said.
McIntosh is described as being 5-foot-10, about 245 lbs. with short brown hair and brown eyes, police said. He was last seen wearing blue jeans, a gray jacket and white sneakers.
Anyone with information on his whereabouts is asked to contact the Windsor Locks police at 860-627-1461.