Michael Knapstein, 59, of Winter Haven, Florida, was last seen July 29, 2020, leaving his home on Avenue A SE. Two days later his vehicle was found abandoned at a business on Cypress Gardens Boulevard. He is 5 feet 11 inches, about 200 pounds, with gray hair and blue eyes.

Knapstein had medical conditions and was not carrying his medication when he disappeared, a factor that led the Polk County Sheriff’s Office to classify him as endangered. Local hospitals were checked without locating him, and the Sheriff’s Office issued a missing person alert. Despite ongoing efforts, he has not been found and the case remains unsolved.

If anyone saw Michael, his vehicle, or has information about his movements around late July 2020, please contact the Polk County Sheriff’s Office.