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.

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.

Tamela Peterson, owner and founder of the Oxford Center, was given a $2 million bond. Three other employees also charged.