The parents of 5-year-old Thomas Cooper filed a $100 million lawsuit against the Oxford Center, its staff, and the manufacturer of a hyperbaric oxygen chamber, alleging corporate greed and negligence led to their son’s death in January.

Thomas died in a fire that erupted inside the chamber during treatment for sleep apnea and ADHD, with his mother unable to save him.

The lawsuit claims the facility failed to warn of risks, provided no emergency escape, and violated basic safety standards.

Four Oxford Center employees have also been criminally charged, including the CEO and the operator of the chamber, NBC News has reported.

The case has drawn attention to the unregulated use of hyperbaric oxygen therapy in wellness centers, which often offer treatments not approved by the FDA.