Billy Blue, 56, said police are closer to unravelling the mystery of his brother's death than they have been since he was slain on his own doorstep in Glasgow's West End on June 24, 2002.
He said: "I am confident Alex's killer will see the inside of a jail cell. The police attitude recently has been spot-on and they are making good progress.
"I've had several meetings with senior officers and I can say that there has been quite an increase in police activity recently."
Billy has fought tirelessly to bring his brother's killer to justice and has even given a name of the man he is convinced ordered the execution to the police and Procurator Fiscal.
Just hours before he was beaten, stabbed and left for dead outside his front door, Mr Blue was last seen sipping a cappuccino alone at the Beanscene cafe in Cresswell Lane.
As well as other interests, Mr Blue and business partner Greg King, a lawyer and cousin of Stefan King, who owns a chain of city nightclubs and bars, ran the successful Taxi Centre in Queensborough Gardens, Glasgow, which supplied private cars to the taxi trade.