A preliminary hearing will be held on Monday morning in Troy District Court for four people charged in connection with the explosion of a hyperbaric chamber that killed a 5-year-old boy in January.

WATCH THE PRELIMINARY HEARING HERE

The explosion happened on Jan. 31, when Thomas Cooper, 5, was receiving hyperbaric oxygen treatment at The Oxford Center in Troy.

Oxford Center owner Tamela Peterson along with Jeffrey Mosteller and Gary Marken each face one count of second-degree murder and one count of involuntary manslaughter. Aleta Moffitt, the operator of the hyperbaric chamber, is charged with one count of involuntary manslaughter and one count of medical records intentionally placing false information on chart.

Michigan Attorney General Dana Nessel announced the charges in March.

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