"AR-15 style rifles have been the weapon of choice in many recent mass shootings, including the Texas church shooting Sunday, the Las Vegas concert last month, the Orlando nightclub last year and Sandy Hook Elementary School in 2012. Here is a list of mass shootings in the U.S. that featured AR-15-style rifles during the last 35 years, courtesy of the Stanford Geospatial Center and Stanford Libraries and USA TODAY research: Feb. 24, 1984: Tyrone Mitchell, 28, used an AR-15, a Stoeger 12-gauge shotgun and a Winchester 12-gauge shotgun to kill two and wound 12 at 49th Street Elementary School in Los Angeles before killing himself. Oct. 7, 2007: Tyler Peterson, 20, used an AR-15 to kill six and injure one at an apartment in Crandon, Wis., before killing himself. June 20, 2012: James Eagan Holmes, 24, used an AR-15-style .223-caliber Smith and Wesson rifle with a 100-round magazine, a 12-gauge Remington shotgun and two .40-caliber Glock semi-automatic pistols to kill 12 and injure 58 at a movie theater in Aurora, Colo. Dec. 14, 2012: Adam Lanza, 20, used an AR-15-style rifle, a .223-caliber Bushmaster, to kill 27 people — his mother, 20 students and six teachers — in Newtown, Conn., before killing himself. June 7, 2013: John Zawahri, 23, used an AR-15-style .223-caliber rifle and a .44-caliber Remington revolver to kill five and injure three at a home in Santa Monica, Calif., before he was killed. March 19, 2015: Justin Fowler, 24, used an AR-15 to kill one and injure two on a street in Little Water, N.M., before he was killed. May 31, 2015: Jeffrey Scott Pitts, 36, used an AR-15 and .45-caliber handgun to kill two and injure two at a store in Conyers, Ga., before he was killed. Oct. 31, 2015: Noah Jacob Harpham, 33, used an AR-15, a .357-caliber revolver and a 9mm semi-automatic pistol to kill three on a street in Colorado Springs, Colo., before he was killed. Dec. 2, 2015: Syed Rizwyan Farook and Tashfeen Malik, 28 and 27, used two AR-15-style, .223-caliber Remington rifles and two 9 mm handguns to kill 14 and injure 21 at his workplace in San Bernardino, Calif., before they were killed. June 12, 2016: Omar Mateen, 29, used an AR-15 style rifle (a Sig Sauer MCX), and a 9mm Glock semi-automatic pistol to kill 49 people and injure 50 at an Orlando nightclub before he was killed. Oct. 1, 2017: Stephen Paddock, 64, used a stockpile of guns including an AR-15 to kill 58 people and injure hundreds at a music festival in Las Vegas before he killed himself. Nov. 5, 2017: Devin Kelley, 26, used an AR-15 style Ruger rifle to kill 26 people at a church in Sutherland Springs, Texas, before he was killed. Feb. 14, 2018: Police say Nikolas Cruz, 19, used an AR-15-style rifle to kill at least 17 people at Marjory Stoneman Douglas High School in Parkland, Fla."