UPDATE 12:37 a.m.: KCPD say Mr. Schwarz was found safe.
Kansas City, Missouri, police issued a Silver Alert Tuesday night for a missing man.
John Schwarz, 78, had an appointment at 2:30 p.m. Tuesday at a local hospital, but did not make the appointment.
Police said GPS coordinates placed him driving near Arrowhead Stadium about 7 p.m. and picked him up again on Interstate 670 near Bartle Hall.
He may be driving a 2012 silver Lexus with Missouri license plate ARMYW4.
Schwarz suffers from dementia and other medical conditions that require medication.
He is 5 feet 9 inches tall and weighs 180 pounds.
Anyone with information on Schwarz should call 911.