A KILLER Celtic fan stabbed a Rangers supporter who called him "Dumbo" because of his big ears.

Lee Noonan attacked the man with a metal pen - just 24 hours after he helped brutally murder a man in his home.

Noonan, 21, had taunted the victim and two friends by belting out Celtic songs as the men headed home from a match at Ibrox in February this year.

The victim then made a jibe about his "stick out ears" - before the vicious thug lashed out leading to the wounded 52-year-old ending up in hospital.

The street attack emerged at Noonan's murder trial at the High Court in Glasgow last week.

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Noonan - along with Paul Green, 31, and Robbie Brown, 18, - face life behind bars after they were convicted of killing James Watt with a golf club and knives at his home in Ibrox.

Jurors heard how Noonan and Brown were near Ibrox Stadium the following day as the Gers fan and his friends walked to their car following Rangers win over Hearts.

The victim remembered being on the ground "kicking out" to defend himself and then ending up in hospital.

Noonan, of Ibrox, pled guilty during the trial to assaulting the man to his severe injury.

Brown was also charged with being involved in the attack, but that allegation was withdrawn against him.

Noonan, Brown and Green will return to court in the New Year.

Lord Summers described their murder of James Watt as "vile and brutal".