Karen Wetzel speaks with PEOPLE about her son Derek Sink's last moments before he was found dead in a Planet Fitness tanning bed in Indianapolis. He had been in the tanning bed for three days before he was discovered.

Indianapolis police are investigating the death of a man found dead in a tanning bed at a Planet Fitness gym Monday morning.

An Indianapolis man named Derek Sink was found dead in the tanning bed of a Planet Fitness after he was reported missing by his family. “We were deeply saddened by the passing of one of our members, and the franchise owner is working with the local authorities in their investigation,