THE wife of a Liverpool gangster who was shot dead outside a gym four years ago today called for his killers to be brought to justice. Caroline Smith made a public appeal for information on the anniversary of the death of husband and dad-of-six Colin Smith. He was gunned down as he left Nel’s Gym, in Alderwood Road, Speke, on Tuesday November 13, 2007. Caroline, who was with her husband for 13 years and had four sons aged between seven and 12 with him, said: “It has been four years since Colin was murdered and I cannot rest until the people who carried out this cowardly attack on my husband are caught and put before the courts. “I am convinced there are people out there who know who killed Colin and I cannot understand how they can stand by and say nothing. They are as cowardly as the person who pulled the trigger. “Our worlds were turned upside down the night Colin was killed and I ask anyone who has any information which could lead to the arrest of those responsible to contact the police, so we as a family can find some closure.” On the night of his death, 40-year-old Mr Smith, a passionate Evertonian, took his eldest son to football training. Police believe he was “lured” to the gym, in Alderwood Avenue, for the attack. As he left the gym at about 8pm to return to his black Ford Galaxy car, he was shot twice at close-range in the stomach. It was believed to be a gangland hit. Officers today appealed to anyone who was in the area at the time who may have seen anything which could help inquiries to come forward.