He is described as a black man, 5ft. 9 inches tall, weighing 195 lbs. He has brown eyes and black and gray hair. To view an image of Lee Johnson, click here.
Authorities say Johnson suffers from Alzheimer's disease and frequents the areas of 71st Street and Jeffery, 48th Street and Winchester, 55th Damen and 71st -76th streets and Stony Island.
Anyone who has seen Johnson or has information concerning his whereabouts is asked to call 911 or the Chicago police Area Two Special Victims Unit.