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Robert Dear, the man charged with killing three people and injuring nine others in a 2015 mass shooting at a Colorado Planned Parenthood clinic, has died

Dear, 67, called himself a "warrior for the babies" and was repeatedly found mentally unfit to stand trial

A spokesperson with the Federal Bureau of Prisons confirmed Dear's death with PEOPLE, while multiple media outlets reported his death was said to be from natural causes

Robert Dear, the man charged in connection with a 2015 mass shooting at a Planned Parenthood clinic in Colorado, has died.

Dear, 67, died while in federal custody on Saturday, according to Federal Bureau of Prisons inmate records reviewed by PEOPLE.

The Associated Press , The New York Times , and Reuters reported that Dear, 67, died while rec

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