Mark Degner was 12 when he disappeared from Jacksonville, Florida, on February 10, 2005. He left Paxon Middle School about 1:15 p.m. after an argument with a teacher, walking out with a 13-year-old friend, Bryan Hayes. Witnesses reported seeing Bryan get into a car, but it is unclear whether Mark got into that vehicle.

Both boys were special education students and left without personal belongings such as coats or school bags. Mark was developmentally delayed, described as having the emotional maturity of a much younger child, and he required medication for bipolar disorder; Bryan also needed daily medical care. Those vulnerabilities, plus the lack of contact after they left school, led authorities to classify them as endangered missing.

Extensive searches produced no significant leads, and periodic updates including age-progression images have been released. The case remains unsolved. If anyone knew Mark’s routines, friends, or saw either boy after February 10, 2005, please share what you remember.