The gunman accused of the worst mass murder in Texas history escaped from a mental health hospital during his stint in the Air Force, according to a 2012 police report. Police took Devin Kelley into custody on June 7, 2012 at a bus terminal in downtown El Paso, Texas, where he had planned to flee by bus after breaking out of Peak Behavioral Health Services, just over 10 miles away in New Mexico, according to NBC Houston affiliate KPRC. Kelley, who was 21 at the time of the escape, had been sent to the facility after he was accused of...