One young woman knew the gunman who carried out the Texas church massacre better than just about anyone else, because they dated for 3 years. Brittany Adcock, 22, says she dated Devin Kelley when she was 13 and still in middle school. “Devin was a monster. He was a pervert. A pedophile,” she told Inside Edition. It's still hard for her to talk about him without crying. “No 13-year-old deserves that, you know, to be taken advantage of by someone that is older and knows better,” she said.