Published: Jul 13, 2010 7:14 PM EDT
Updated: Jul 13, 2010 4:15 PM EDT

PAHOKEE, Fla. (AP) - Authorities say a 98-year-old man who had been missing for days has been found dead in Lake Okeechobee.

Charles Mayrowetz's body was found Sunday. He had been reported missing from his Boca Raton-area home on Thursday.

The Palm Beach County Sheriff's Office says Mayrowetz had been driving on the lake levee in Pahokee when he drove backward through tall grass and some rocks into the lake marsh.

Authorities found Mayrowetz in the water outside his car. The medical examiner determined drowning was the cause of death.

Authorities believe Mayrowetz was in the early stages of dementia.