Don was last seen at approximately 3:30pm riding his bicycle in Gage Park in Topeka, KS. The door to his residence was unlocked; however, there was no sign of a struggle. His medication, glasses, cigarettes and lighter were also located at his residence. There has been no bank account activity since his disappearance and he never picked up a paycheck from his job at Kansas Neurological Institute. Don has a medical condition and needs medication.