The Centennial State has seen its share of fatal mass shootings in the US in recent years, including those that rocked national and global media headlines, after multiple people, including school children and teachers, were shot and killed.
Here is a list of the six shootings with the highest number of deaths that Colorado has seen in recent years.
STEM School Highlands Ranch Shooting, 7 May 2019
The 7 May 2019 shooting killed one student, who tackled one of the gunmen, while 8 others were injured. Two shooters were captured and stood trial for the murders.
Thornton Shooting, 1 November 2017
Taking place on 1 November 2017 in a Walmart store, the attack by a lone gunman, Scott Ostrem, killed three people. He shot them near cash registers before fleeing the scene.
Colorado Springs Planned Parenthood, 27 November 2015
The 2015 Colorado Springs shooting occurred on Halloween, with the killer, Noah Harpham, shooting three dead as he openly carried a firearm. Later, Harpham was killed in a shootout with four police officers.
Aurora Shooting, 20 July 2012
The attack that claimed 12 lives occurred on 20 July 2012. The perpetrator, James Holmes, opened fire during a midnight showing of the film "The Dark Knight Rises". Apart from the dozen of those dead, he wounded 70. The shooting is the second deadliest in the state after the Columbine massacre.
YWAM and New Life Shootings, 9 December 2007
The shooting at two church organizations in Arvada and Colorado Springs killed four people and injured five. The gunman, Matthew Murray, committed suicide, shooting himself in the head.
Columbine High School Massacre, 20 April 1999
The Columbine shooting had two students storming into Columbine High School killing 12 students and one teacher. Both teenage murderers were killed.