Australian ex-cop Colin McLaren has new John F Kennedy death theory Australian writer Colin McLaren, standing, explains a new John F Kennedy shooting theory during a Television Critics Association event in Beverly Hills. Secret service agent Clint Hill climbs into the presidential limousine in a bid to protect first lady Jacqueline Kennedy after President John F Kennedy had been shot in the head in Dallas in 1963. Australian writer Colin McLaren, who believes a US secret service officer fired one of the bullets that felled John F Kennedy. Weeks before the 50th anniversary of JFK's assassination, cable channel ReelzChannel will broadcast a docudrama that suggests the president was accidentally shot by a Secret Service agent. JFK: The Smoking Gun, is based on the work of retired Australian police detective Colin McLaren and the book Mortal Error: The Shot that Killed JFK, by Bonar Menninger. Mr McLaren spent four years combing through evidence from Kennedy's death on November 22, 1963, in Dallas. He and Mr Menninger also relied on ballistics evidence from an earlier book by Howard Donahue. "What we're saying is that we believe it was a tragic accident in the heat of that moment," Mr McLaren told the Television Critics Association. When Lee Harvey Oswald fired his first shot, Mr McLaren said Hickey responded by trying to fire back on Oswald's position using his Secret Service-issued rifle. But because he was inexperienced with the weapon and the car lurched forward, Mr McLaren said the shot went awry and accidentally hit Kennedy, who was struck in the neck but quite possibly not fatally wounded by Oswald's second shot. "We don't suggest that he was in any way involved in a conspiracy," Mr McLaren said of Hickey. The two-hour docudrama, a Canada-Australia co-production, will be broadcast in the US, Australia and Canada in November. It is produced by Australia's Cordell Jigsaw Zapruder (CJZ) and Muse Entertainment, and is set to screen in Australia on SBS, says CJZ. In 2011, the cable channel aired The Kennedys after History Channel dropped the miniseries amid reports that the real-life Kennedy family was unhappy about the project.