Uploaded August 2026 | Updated September 2026, 2 weeks ago

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One of the four people charged after a 5-year-old boy was killed in a hyperbaric chamber explosion at an Oakland County health care facility in January 2025 learned his sentence on Monday.
Tamela Peterson, 59, of Brighton, Jeffrey Mosteller, 66, of Clinton Township, Gary Marken, 66, of Spring Arbor, and Aleta Moffitt, 61, of Rochester Hills, were charged after Thomas Cooper was killed when the hyperbaric chamber he was receiving treatment in exploded at the Oxford Center in Troy on Jan. 31, 2025. The boy’s mother was also injured in the explosion.
On July 21, Mosteller pleaded no contest to involuntary manslaughter. The second-degree murder charge was dismissed. 
As part of a sentencing agreement, Mosteller was sentenced on Aug. 31 to 19 months to 15 years in prison.


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