A man who shot dead his victim in what people believe was a case of mistaken identity has been jailed for life.
The judge said O'Brien had shown "absolutely no remorse"
Marvyn Bradshaw, 22, of Top Valley, Nottingham, was shot in the back of the head as he drove from the Sporting Chance pub car park in August 2003.
Michael O'Brien, 23, of Aspley, Nottingham, had denied murder but was convicted by a jury at Nottingham Crown Court on Monday.
The judge recommended he serve at least 24 years of his sentence.
During the trial, the court was told Mr Bradshaw had probably been mistaken for another person involved in an earlier argument with O'Brien on the night of the shooting.
Sentencing, Judge Richard Powell said O'Brien had shown "absolutely no remorse" for what he did.
He said he had killed a wholly innocent man in a
"deliberate and calculated murder".
In a statement, Mr Bradshaw's family said: "The fact that (O'Brien) shot the wrong man is no consolation to us.
"A prison sentence will not bring Marvyn back to us. We have to live the rest of our lives without him. The thought of that is terrifying.
"Throughout this ordeal, all that we have wanted is to see justice done for Marvyn. Thankfully, today, justice has been done."
Det Ch Insp Phil Walker praised the family's courage in giving evidence during the trial.
He said that without their evidence, O'Brien could still be out on the streets.
Det Ch Insp Walker added: "He is a dangerous and violent man who has been involved in crime for many
years. I'm relieved he is going to be in prison for a long time..."
"(Marvyn) worked six days a week, was not involved in any criminality, and was loved by his family."
Police are still looking for Gary Salmon, 32, from Nottingham, who had been drinking with O'Brien on the night of the killing.
Detectives say he has family and friends in Bulwell and Bestwood as well as contacts in Birmingham, Derby, Brighton, London, Scotland and Leicester.
Detectives say he uses the nicknames Fish, Lol and G, and the surnames McKenzie and Garvey.
Earlier this year a £10,000 reward was put up for information leading to his arrest.