Thomas Cooper, 5, of Royal Oak died in a hyperbaric oxygen chamber fire Jan. 31 at the Oxford Center in Troy.

The CEO of the Oxford Center and three workers are criminally charged in Thomas' death.

Video footage shows about 40 minutes into his hyperbaric oxygen treatment at Troy's Oxford Center, 5-year-old Thomas Cooper moved around inside the chamber enough to pull the sheet off the mattress — and when the boy's knee appeared to touch the bare mattress, it sparked the fire that killed him, according to a hyperbaric safety expert who testified on Tuesday, Sept. 16 in a court hearing for employees criminally charged in the boy's death.

“A second later, the entire chamber was alight,” said Francois Burman , who reviewed video footage from the day of the fire on Jan. 31.

Burman is a mec

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