Michael O'Brien showed 'no remorse' for killing Mr Bradshaw

In August 2003 Michael O'Brien went out drinking with his friend Gary Salmon.

What happened after then may have directly led to O'Brien's mother and stepfather being shot dead in revenge by two assassins nearly one year later.

On that night last year the two men headed to the Sporting Chance in Top Valley, where there was late-night drinking.

But O'Brien was turned away. Soon after, the pair returned to the pub with a shotgun, a court was told.

O'Brien used this gun to shoot Marvyn Bradshaw, 22, in the head as he drove away. But O'Brien had got the wrong man.

Newspaper tributes

O'Brien's murder trial heard he had probably mistaken Mr Bradshaw for another man who had argued with the killer earlier in the evening.

Marvyn Bradshaw was killed outside a pub in Nottingham

Sentencing O'Brien in July, the judge said he had shown "absolutely no remorse" for the killing and told him he should stay in jail for 24 years.

Before the conviction, O'Brien's mother Joan Stirland and stepfather John Stirland, had left their home in Nottingham for Trusthope.

They were found shot dead there on Sunday.

Police are investigating whether the killings at Trusthope were revenge for the original shooting by O'Brien.

Man wanted

One man police still want to talk to about the earlier shooting is O'Brien's drinking pal Gary Salmon.

He disappeared after the shooting and has eluded capture ever since.

A reward has been offered for the arrest of Gary Salmon

A �10,000 reward has been put up for information leading to his arrest. The 32-year-old uses a number of aliases.

A Nottingham police spokesman said: "We are still looking for Gary Salmon.

"He is known as Fish, Lol and G and uses the surnames McKenzie and Garvey."

He has links with many areas including Bulwell and Bestwood in Nottingham, Birmingham, Derby, Brighton, London, Scotland and Leicester.

The Stirlands' murder and the trail back to Nottingham has once again put the spotlight on the city's gun crime problem.

Other high-profile shootings include the death of Marian Bates in her jewellery shop in the Arnold area of the city.

Following that shooting, Prime Minister Tony Blair visited the city to speak to victims of gun crime.

A specialist team working under Operation Stealth is targeting drug and gun crime in the city.

Nottingham was also the first city on the mainland UK to introduce guns for beat police officers.