BBC News Published image copyrightReuters image captionJesús Santrich was one of the negotiators of the peace deal but later became disillusioned The Colombian left-wing rebel leader known as Jesús Santrich has been killed in Venezuela, members of his group say. Santrich was a key figure in peace negotiations but later joined a dissident group and continued fighting. The dissidents, Second Marquetalia, said he had been killed by Colombian armed forces but offered no evidence. Colombia's defence minister said intelligence reports suggested he had died in a shootout between gangs but stopped short of confirming his death. What is known about what happened?