On Monday morning – just hours after the Planet Fitness on Hardegan Street opened for the day – officers were called to a report of a body inside a tanning bed at the gym. Gym-goer Elizabeth Len revealed she had gone to the Planet Fitness that morning and noticed a “foul smell” which seemed to get stronger near the tanning rooms.

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.