Yes, there were probably few Outfit associates who were killed by the Touhy gang, especially associates of Rocco DeGrazia's crew. But Barker was a completely different case and he was allegedly killed by the Outfit by being almost cut in half from machinegun bullets from a long distance, and the interesting thing is that none of the people around Barker didnt receive a scratch, which means that the shooters were quite experienced (same as the Esposito, Aiello and other hits from that era).