Mark William Kotlarz, 26, was last seen July 5, 1991, near the northeast part of Vail Lake in Riverside County, California. He disappeared under unknown circumstances and has not been heard from since. At the time he was 5 feet 9 inches tall, about 150 pounds, with brown hair, green eyes, and wore glasses.

His right arm bore a distinctive 12-inch scar from a previous fracture. The case is classified as endangered missing. Riverside County Sheriff’s Department is handling the investigation; dental and DNA records are available to assist identification but no concrete answers have emerged.

Mark’s family continues to seek closure. If anyone was in the Vail Lake area on or around July 5, 1991, or has information about Mark’s movements before or after that date, please contact the Riverside County Sheriff’s Department.