Seth Kienzle, 26, was reported missing after he failed to show for a planned meeting with friends in Fort Collins in February 2016. His car was found abandoned in the Pine Brook Hills area north of Boulder, stopped in the middle of the road near Wild Horse Circle and Linden Drive with the windows down. Four days after the vehicle was discovered, surveillance footage captured Kienzle late at night knocking on a door at a residence on Carriage Hills Drive about three miles from the abandoned car; the resident closed the door after he asked if there was a party there.

The Boulder County Sheriff’s Office concentrated searches around that sighting using ground teams, search dogs, drones, and a helicopter, but the efforts produced no leads and the official search was later suspended. Authorities noted a history of drug addiction; friends said he had never intentionally disappeared. The case remains open and unresolved.

If anyone saw Seth in the Pine Brook Hills or Carriage Hills area in February 2016, please share what was observed.