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With flags at half staff, Maribeth Forst, with her dog Max, stands near a makeshift memorial on a police cruiser for the victims of what authorities describe as an ambush Monday, Jan. 1, 2018, at the Douglas Country Sheriff Substation in Highlands Ranch, Colo. (Helen H. Richardson/The Denver Post via AP)

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Colorado authorities were contacted with concerns about the mental health of Matthew Riehl more than a month before he shot and killed a deputy and wounded four others.

By Associated Press January 2, 2018