DETROIT (Scripps News Detroit) — A judge heard testimony on Monday in connection with the Jan. 31 explosion at a medical facility in Troy, Michigan that claimed the life of a little boy.

Five-year-old Thomas Cooper was at The Oxford Center receiving treatment in a hyperbaric chamber when it exploded, killing him.

Michigan Attorney General Dana Nessel announced the charges in March.

WATCH | Press Conference Reveals ‘Many Failures’ in Boy’s Hyperbaric Chamber Death

Photo by: Family of Thomas Cooper/ WXYZ

“This tragedy could have been prevented if proper safety protocols were followed,” Nessel said in a previous statement. “Instead, deliberate negligence and a blatant disregard for safety cost a child his life. I appreciate the investigatory efforts of the Troy Police Department.

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