A South Carolina police officer was shot and killed in the line of duty Sunday morning before the man who pulled the trigger took his own life, Cayce Police Chief Chris Cowan said. Roy Andrew “Drew” Barr, 28, is the officer who died, Cowan said during a news conference at the Lexington 2 Innovation Center. “Our hearts are breaking in Cayce. Officer Drew Barr has been an important part of the Cayce family since 2016,” Cayce Mayor Elise Partin said at a news conference. “All of our Cayce officers, our Cayce team, and our Cayce citizens mourn with Officer Barr’s family.” Austin Henderson, 36, was…