A former safety manager at a Michigan healthcare facility has been sentenced to 19 months in prison for his role in the death of a five-year-old boy during a hyperbaric oxygen therapy session. Jeffrey Mosteller, 66, pleaded no contest to involuntary manslaughter in Oakland County Circuit Court on Monday. He was the safety manager at the Oxford Center, an alternative healthcare facility in Troy, Michigan, which treats children with conditions like autism, ADHD, and autoimmune diseases using hyperbaric oxygen therapy (HBOT). The therapy involves placing patients in a pressurized chamber filled with pure oxygen, which is approved by the U.S. Food and Drug Administration (FDA) for certain medical conditions such as severe burns and non-healing wounds. The incident occurred in January 2025 when five-year-old Thomas Cooper, of Royal Oak, Michigan, was undergoing treatment for ADHD and sleep apnea. A fire broke out inside the hyperbaric chamber, leading to an explosion that killed Thomas. According to an expert who reviewed video footage, the child had moved enough to pull a sheet off a mattress, creating a static electricity spark. The oxygen-rich environment in the chamber caused the spark to ignite into a flash fire, killing Thomas within seconds. His mother suffered severe burns while trying to open the chamber’s tank to rescue him. Mosteller is one of four former employees of the Oxford Center charged in connection with Thomas’s death. The others, including the facility’s founder and CEO Tamela Peterson, 58, and facility manager Gary Marken, 65, were charged with second-degree murder and involuntary manslaughter. Aleta Moffitt, 60, who was operating the hyperbaric chamber at the time of the explosion, was charged with involuntary manslaughter and falsifying medical records. At the time of Mosteller’s sentencing, the other three were still awaiting trial. The death has sparked renewed debate about the safety of hyperbaric oxygen therapy, which has seen increased use in alternative medicine circles. While the FDA has approved HBOT for specific conditions, critics argue that its broader application in mainstream healthcare remains controversial. Some supporters of former U.S. Health Secretary Robert F. Kennedy Jr. have endorsed the therapy, while others remain skeptical of its growing influence. Thomas’s parents have filed a $100 million wrongful death lawsuit against the clinic and the manufacturer of the hyperbaric chamber.