Phillip Sherriff, 37, was fatally wounded at Pulse nightclub in central London following a performance by Brit award-winning singer Jessie J.
Company director Ashley Charles, 25, was remanded in custody, charged over the attack which police are now investigating as murder.
Mr Sherriff, a married telecommunications professional from Preston, Lancashire, was rushed to the Royal London Hospital after suffering a neck injury at the club in Southwark on Tuesday night.
Medics battling to save his life were later forced to operate on his skull to remove pressure from an injury to his brain.
Jessie J left BlackBerry party
, But the wounded man - who remained in a critical condition - died yesterday morning.
His photographer wife Jane — who had kept a hospital vigil — faced having to break the news of his death to their children as she headed back home to Preston, Lancs.
A pal said: “She is devastated.”
Jessie - who had finished her set just about 20 minutes before the incident - put a message on Twitter speaking of her shock and offering her sympathy.
She said: “I am lost for words. All I can say is my thoughts, love and respects are with the family and children of the man who attended the blackberry gig last week who sadly lost his life this morning So sad...”
“A post-mortem examination will be arranged in due course,” a Scotland Yard spokesman said.
Mr Sherriff had been invited to the BlackBerry function along with celebrities including Celebrity Big Brother's Georgia Salpa, stars of The Only Way Is Essex, BlackBerry competition winners and journalists
Charles, of Nevanthon Road, Leicester, spoke only to confirm his name and date of birth when he appeared in the dock at Camberwell Green Magistrates’ Court accused of attempted murder.
The defendant, dressed in a dark jumper and jeans, was ordered to attend Inner London Crown Court on April 20.
An application for bail was refused.