PORTLAND, Maine (AP) — Maine’s corrections commissioner says state and federal experts will review policies and procedures following the suicide of a 16-year-old transgender boy.

Charles Knowles killed himself this month while detained at Long Creek Youth Development Center. His mother has said he didn’t receive the clinical mental health treatment he needed.

The teen was being held for setting fire to his house in August.

Maine Department of Corrections Commissioner Joseph Fitzpatrick calls the death a “tragedy” and says it’s the first death of a young resident in two decades.

He says staff will continue to provide emotional support and treatment to children at the facility.

The commissioner says he is legally bound from commenting on an ongoing investigation. But he says the facility provides comprehensive mental health treatment to all young people.

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