John P. Katsilieris was 17 when he left his family’s home in Oak Park, Illinois, in the summer of 1985. The most commonly cited date is August 15, 1985. He was a musician who took five guitars with him and was described as tall, with brown hair and blue eyes. He was reportedly wearing blue jeans and tennis shoes when he left.

Some accounts place him in Santa Ana, California, on August 16, 1985, a day after he left home, but after that possible sighting no one has heard from him. The Santa Ana Police Department is handling the investigation. Investigators have used age-progressed images and the family has submitted DNA samples, but the case remains unsolved.

What information do readers in Illinois or Southern California have about young musicians or sightings around mid-August 1985 that might help explain John’s disappearance?