Through violence prevention, community vigilance and new laws, Colorado tries to reshape a legacy molded by modern mass shootings. A memorial around the King Soopers supermarket in Boulder, Colorado, where 10 were killed in a mass shooting on March 22, 2021. (Courthouse News photo / Amanda Pampuro) BOULDER, Colo. (CN) — The day after a suspected gunman killed 10 people shopping at a Colorado grocery store, a woman 260 miles away told the Alamosa County Sheriff’s Department she was worried her 36-year-old son Marcos Martinez would become an active shooter. “She advised that her son’s behavior has become very strange and believed that he is on drugs,” the 20-page request for an extreme risk protection order filed in April said. The so-called “red flag” law removes firearms from individuals deemed to be a danger to themselves or others.