January 2, 2018
Tributes to a deputy killed in a shootout cover a patrol vehicle parked outside a Douglas County, Colo., Sheriffs Department substation Monday, Jan. 1, 2018, in Highlands Ranch, Colo. The deputy was killed and four other deputies were shot while responding to a call at a nearby apartment complex early Sunday. (AP Photo/David Zalubowski)
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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.