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.

Days after Derek Sink’s body was discovered in a Planet Fitness tanning bed, his mom shared more about her son and what may have led up to the moments before his death.

The circumstances of his death remain under investigation as detectives have not indicated if there is any suspicion of foul play.