COLORADO SPRINGS, Colorado (CNN) -- A Colorado Springs megachurch instituted security precautions after a shooting at a Denver area mission center earlier Sunday, saving "hundreds of lives" at the New Life Church, senior Pastor Brady Boyd said Monday. A New Life parishioner acting as a security guard shot and killed a gunman who entered the church Sunday afternoon after he had gotten no more than 50 feet inside the building, Boyd said.... Boyd said the female security guard was a hero in preventing further bloodshed, rushing to confront the gunman just inside the church. "She probably saved over a hundred...