UPDATED 1:09 p.m.
Dewayne Riley was found Saturday near Marlow, Okla. about ten miles north from his home.
According to family members, he had walked there and had fallen into a creek.
A Silver Alert has been issued for a Duncan man.
He is 66 year old, Dewayne Riley. He was last seen this afternoon wearing jeans, a brown jacket and a stocking cap.
The Duncan Police Department reports he has Alzheimers and was last seen leaving his home on foot.
Contact Duncan Police if you have any information on his whereabouts.