Two men have gone on trial accused of murdering another man outside a Nottingham pub.
Patrick Marshall was shot dead outside the Park Tavern
Patrick Marshall, 46, was shot dead outside the Park Tavern in Basford in February 2004.
Craig McKay, 33, from Stapleford, and John Patrick McSally, 50, from Basford, have been charged with his murder.
Mr McSally was also accused of trying to murder another man outside his home three months later. Both deny the charges at Leicester Crown Court.
On Thursday, the jury heard about two separate crimes which the prosecution described as an execution and an attempted execution which were "swift, clinical and brutal".
Mr McSally was also charged with possessing a revolver which the prosecution said may have been used in both crimes.
The court heard Mr Marshall had arranged to meet Mr McSally outside the Park Tavern because he wanted to buy a gun from him in order "to settle a score" but instead was shot dead himself.
The jury was told Mr McKay told his friends that he killed Mr Marshall because the police had discovered that he had supplied the gun used in the murder of the jeweller Marian Bates and he suspected - wrongly - that Mr Marshall was the one who had told them.
The trial was also shown CCTV footage of the shooting of Derek Senior in the driveway of his home in Nottingham three months later, days after four men were convicted of beating him up.
The prosecution said the victim was targeted because he had given evidence against the gang after refusing to be bought off.
Mr Senior was due to give evidence in the trial, which continues.