APOLLO BEACH, Fla. (FOX 13) - UPDATE: The Hillsborough County Sheriff's Office say Walter John Shaffer has been located.
Deputies are asking for the public's help to find a missing elderly man in Apollo Beach.
The Hillsborough County Sheriff's Office is searching for 70-year-old Walter John Shaffer, who was last seen at his home located at 6302 Flamingo Drive just before 5 p.m.
Investigators say Shaffer has cognitive impairment due to a brain injury. He carries a battery connected to his heart that only has an 8-hour life span. Detectives say they are working quickly to locate Shaffer before the battery dies.
He was last seen wearing a green T-shirt, a gray vest and blue shorts.
Anyone with information on Shaffer's whereabouts is urged to call the Hillsborough County Sheriff's Office at 813-247-8200.