"I was actually in the parking lot when the chamber exploded, so I kind of saw everything happening," she said. "I was kind of numb, shocked, sick to my stomach."

Troy police say Tamela Peterson ran away when asked for her cellphone after Thomas Cooper died in a hyperbaric chamber fire at the Oxford Center.

Prosecutors said a safety manager at the Oxford Center conducted “his own experiments” on a hyperbaric chamber to prove to employees it was safe prior to a deadly explosion that killed a 5-year-old boy.

Oxford Center CEO Tami Peterson was arraigned on a charge of second-degree murder Tuesday after a 5-year-old boy died in a hyperbaric chamber explosion at the facility earlier this year.

Tamela Peterson, 58, of Brighton, is one of three employees charged with second-degree murder with an alternate charge of manslaughter, to be determined by the jury.

The CEO of the Oxford Center in Troy is accused of sending texts mocking a 5-year-old boy while he was on fire after a hyperbaric chamber exploded. Tamela Peterson and three other employees have been charged in connection with the explosion that killed Thomas Cooper.