Watch London Tonight's report just after Phillip Sherriff's death:
Charles took a beer bottle from Mr Sherriff's hand and swung it behind him, where it broke, and then plunged it into Mr Sherriff's neck.
The judge said Charles had done something "which was truly out of character".
Andrew Hall QC, for Charles, said he acted "in a split second of madness".
A graphic designer was jailed for a minimum of 14 years today for killing a telephone executive with a broken bottle after a Jessie J gig.
Ashley Charles, 26, was found guilty of murdering Phillip Sherriff, 37, and jailed for life at the Old Bailey.
Mr Sherriff died in April four days after being attacked at Pulse nightclub in central London, shortly after the singer had performed.
Charles, of Nevanthon Road, Leicester, denied the charge, claiming he acted in self-defence.
But Judge Paul Worsley said Charles killed Mr Sherriff, of Preston, Lancs, because he was annoyed.
Graphic designer Ashley Charles was jailed for a minimum 14 years at the Old Bailey today after being convicted of murdering telephone executive Phillip Sherriff after a Jessie J gig in London.
Ashley Charles has been found guilty of the murder of Phillip Sherriff. The incident took place after the Blackberry BBM party in south London.