Aaron Alexis
Tanice Cisneros walks by an anti-gun sign on the way to leave flowers for her friend, Rikki Olds on Tuesday, March 23, 2021. Olds was a King Soopers employee that was killed at the Boulder King Soopers on Monday. (Jerilee Bennett/The Gazette via AP)
Mass shooters exploited gun laws, loopholes before carnage

By Michael R. Sisak Mar. 25, 2021 12:18 AM EDT