Published: Jan 29, 2014 11:48 AM EST

PORT CHARLOTTE, Fla.- Charlotte County detectives are attempting to locate a 54-year-old Port Charlotte man who has not been seen since last Thursday.

John David Simmons, of the 400 block of Wabash Avenue, was last seen at his residence by a relative last Thursday. He usually goes to another relative’s house on Sundays for dinner, but did not show up on Sunday as expected. They became worried and called to report Simmons as missing.

During the investigation, detectives found that Simmons left his cell phone, work keys and a note at the residence. The contents of the note seemed to indicate that Simmons might be endangered. Simmons has been entered into the nationwide computer system as a missing/endangered adult.

Simmons drives a 2000 Ford F150 extended cab pickup truck with Florida tag G62-6SR. The truck has a white cab and a silver bed with a red stripe. The attached photo was taken around 2004. The vehicle’s paint is now faded and it has some scratches and dents.

Anyone with information on the location of John David Simmons or his vehicle is asked to please call the Sheriff’s Office at (941) 639-2101, or, in another jurisdiction, the most appropriate local law enforcement agency.