A brutal thug who killed a stranger in an unprovoked street attack has been jailed for life.

A judge today ordered Luke Quinn to serve a minimum 14 years behind bars.

The 33-year-old had earlier been convicted of murdering Simon Richardson, brother of celebrity chef Ferrier, in Glasgow city centre in November last year.

Quinn had previously been deported to the UK from New Zealand after committing a sex offence.

The 45-year-old victim had been on a night out with friends when he was later set upon by burly Quinn.

The killer later boasted in a text to his Taekwon Do instructor of what he had done.

Sentencing, Judge Bill Dunlop today told Quinn: "No value can be put on the life that was lost and that you took. Nothing can do that."

Quinn showed no emotion as he was lead handcuffed to the cells.

A jury heard how the victim Mr Richardson, of Paisley, had been on a night out and was looking for a taxi when he encountered telesales worker Quinn.

Initially the men were caught on CCTV chatting before Quinn suddenly lashed out, and Mr Richardson slumped to the ground. Quinn then stamped on his defenceless victim, and rifled his pockets before continuing the assault.

Mr Richardson died from internal bleeding caused by a blow to the abdomen.

When Quinn was charged with murder, he told police: "Why is God doing this to me?"

In a further tragedy for the family, Mr Richardson's mother died six weeks later on Christmas Day.

Quinn denied murder and claimed that he was suffering from diminished responsibility due to Asperger's Syndrome.

He did not give evidence, but told a psychologist that he snapped because he didn't like being touched and Mr Richardson had been patting him on the back when he spoke to him.

Quinn's QC today said the victim was "wholly innocent" and was "the wrong man in the wrong place at the wrong time."