A helicopter pilot and Britney Spears ex-boyfriend — who helped the pop princess quit booze — has been killed by Taliban fighters in Afghanistan. John Sundahl, 44, was shot down during a flight from Kabul, where he’d been working as a private contractor transporting officials across the war-torn nation, according to the Daily Mirror. “She is devastated,” a source close to Spears told the UK paper. “Britney thought he was a lovely man.” A former real estate whiz, Sundahl dated Spears, 33, in 2007 after they met at Alcoholics Anonymous in Los Angeles. He spoke openly about her alcohol abuse.