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David Settle from Bowling Green, Kentucky reads the memorials to the victims at the Columbine Memorial in Clement Park in Littleton. Settle, a retired firefighter who is visiting Colorado, came out to the memorial recalling exactly where he was when Columbine occurred. It was the day before the 17th anniversary of the high school shooting in Littleton on Tuesday, April 19, 2016.

Thirteen small white cross are lined up along the walkway leading to the Columbine Memorial. Visitors bring flowers and spend time at the memorial on Monday, April 20, 2015 to mark the 16th anniversary of the deadly shooting at Columbine High School which left 12 students and one teacher dead. The school was closed for the day, as it has been every year on this day since the shooting occurred in 1999.

Visitors including Shea Mohnhaupt, 16, right, and her mother Stacy Slaton, along with Shea's friend Ambrosia Deming, left, 16, bring flowers and spend time at the Columbine Memorial on Monday, April 20, 2015. Today marks the 16th anniversary of the deadly shooting at Columbine High School which left 12 students and one teacher dead. The school was closed for the day, as it has been every year on this day since the shooting occurred in 1999.

The crowd started to fill the amphitheater for the memorial event planned by Columbine families at the Clement Park amphitheater April 20, 2009. This marks the tenth anniversary of the Columbine shootings where 12 students and one teacher were gunned down by inside the school on April 20, 1999. Killed at Columbine High School on April 20, 1999: Cassie Bernall, Steven Curnow, Corey DePooter, Kelly Fleming, Matthew Kechter, Daniel Mauser, Daniel Rohrbough, Rachel Scott, Isaiah Shoels, John Tomlin, Lauren Townsend, Kyle Velasquez, teacher Dave Sanders.

Sue and Rick Townsend share a quiet moment during a presentation to end the the ceremony at the Clement Park amphitheater April 20, 2009. This marks the tenth anniversary of the Columbine shootings where 12 students and one teacher were gunned down by inside the school on April 20, 1999. Killed at Columbine High School on April 20, 1999: Cassie Bernall, Steven Curnow, Corey DePooter, Kelly Fleming, Matthew Kechter, Daniel Mauser, Daniel Rohrbough, Rachel Scott, Isaiah Shoels, John Tomlin, Lauren Townsend, Kyle Velasquez, teacher Dave Sanders.

Principal Frank Deangelis of Columbine High School attends a candlelight vigil to honor and remember those touched by the Columbine tragedy at the Columbine Memorial in Clement Park, Littleton on Sunday, April 19, 2009.

22-year-old Jetta Sadusky comforts her older sister Cassie 25, as she looks at the cross bearing the photo of her friend Rachel Joy Scott at the Columbine Memorial Garden in Chapel Hill Memorial Gardens near Littleton, April 20, 2009. Cassie was a sophomore at Columbine on the day 12 students and a teacher were killed at the High School 10 years ago. "This is a relaxing place I can come," she said. Cassie was close to Corey DePooter, Scott and grew up with Matthew Kechter since elementary school.

Visitors react to the Columbine Memorial after the dedication. 300 family and friends of the Columbine High School shooting victims joined thousands of community members in the unveiling of the Columbine Memorial at Clement Park on Sept. 21, 2007. The circular memorial features outer and inner circles with plaques containing personalized messages from family members and the community.

Visitors file by the inscribed plaques on the outer circle of the Columbine Memorial. 300 family and friends of the Columbine High School shooting victims joined thousands of community members in the unveiling of the Columbine Memorial at Clement Park on Sept. 21, 2007. The circular memorial features outer and inner circles with plaques containing personalized messages from family members and the community.

Nine-year-old Haley Steele reaches out to smell a flower left at the Columbine Memorial at Clement Park, Sept. 22, 2007. After 8-years the memorial honoring those lost at Columbine High School is open to the public.

People gather for a candlelight Vigil to honor and remember those touched by the Columbine tragedy at the Columbine Memorial in Clement Park, Littleton, Colorado on Sunday, April 19, 2009.

Columbine High School students take part in a candlelight vigil at the Columbine Memorial at Clement Park in Littleton, Colo. Sunday April 19, 2009 in honor of the tenth anniversary of the school shooting.

Alex Gray, 19, left, and his girlfriend, Cindy Hoang, 17, both seniors at Bear Creek High School, take part in a candlelight vigil at the Columbine Memorial at Clement Park in Littleton, Colo. Sunday April 19, 2009 in honor of the tenth anniversary of the school shooting.