Police shared a new photo Tuesday of a missing 59-year-old Valparaiso man who never returned home Saturday from Porter-Starke Services, a community mental health center. 

Donald Gildersleeve was last seen at the Valparaiso Porter-Starke offices at 10 a.m. Saturday, police said.

Valparaiso Police Sgt. Mike Grennes said Gildersleeve requires daily medications but has not yet been found. A statewide Silver Alert said Gildersleeve is believed to be in "extreme danger."

Gildersleeve lives on his own with the assistance of Porter-Starke Services. He is believed to be on foot or on a bicycle and is described by police as white, 6 feet tall, weighing 210 pounds, with brown hair, blue eyes and a beard.

Police and officials from Porter-Starke have searched nearby businesses and other locations.

If anyone sees him or believes they may have seen him recently, police ask that they contact the Valparaiso Police Department by dialing 911 or text a tip to TIP411 (219-847-411) and enter “Valpo” as the first word in the message field prior to sending the tip.