Colorado authorities were warned about gunman’s mental state

DENVER (AP) — A man who shot and killed a Colorado deputy and wounded four others along with two civilians was an attorney and an Iraq war veteran who had posted videos online in recent months criticizing professors and law enforcement officials, authorities said Monday.
Shooter Matthew Riehl, 37, died Sunday during what officials called an ambush at his apartment building in Highlands Ranch, 16 miles (28 kilometers) south of Denver.
Authorities say Riehl fired more than 100 rounds in his