Stephen Ambrose Gill, 20, was last seen June 18, 2024, at about 10:28 a.m. near 223rd Avenue and West Meyers Street in Wittmann, Arizona. He told his younger siblings he was going for a 10- to 20-mile bike ride and left on his black and red Mongoose mountain bike wearing a black t-shirt with light green patterns, shorts, and a tan hat. He left his cell phone and wallet at home for his siblings to use in an emergency.

When he did not return that afternoon, family members alerted the Maricopa County Sheriff’s Office and organized searches with friends and community volunteers. The desert terrain and nearby Luke Air Force Base, which limits some search resources, have complicated efforts. Stephen’s family says he was happy that morning and did not intend to run away. No significant leads have emerged so far.

If anyone saw Stephen or his black and red Mongoose mountain bike on June 18 around Wittmann, please contact the Maricopa County Sheriff’s Office with any information.