Tai Park, 77, lived in the Katy area. His family reported him missing on Thursday afternoon.
Fort Bend County Sheriff says someone gave Park a ride to the McDonald's on I-10 near FM 1463 on Thursday and then dropped him off.
He was then seen walking eastbound on the I-10 service road toward Pin Oak.
Park was found Friday afternoon along Buffalo Bayou behind the Woodcreek Reserve.