Singer Jessie J, who performed at the BlackBerry-sponsored party, says she is "lost for words" at the news of a fatality resulting from a stabbing at the event.
Phillip Sherriff, 37, died in hospital this morning after a four-day battle to save his life.
I am lost for words. All I can say is my thoughts, love and respects are with the family and (cont) http://t.co/s7yrrC19
Her full statement reads:
"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..."
More top news
Over 100 people are missing and feared to have been buried under debris following a landslide in China.
Members of the London community have rallied round to offer their help to residents of the evacuated Chalcots estate in Camden.
The two children of murdered MP Jo Cox will unveil a coat of arms in the Houses of Parliament in a touching tribute to their mother.