A fan of Bring Me The Horizon, who died at a concert at Alexandra Palace, was named.
Around 10 pm, emergency services were called to the scene to evoke a man who was not feeling well. It is believed that the person, now locally known as Ali Mills, died on the scene.
The group issued a statement after the announcement of the tragic death, saying they were "horrified" by this fatality, reports the Hertfordshire Mercury.
The group tweeted: "Words can not express the horror we feel tonight after hearing of a young man's death at our concert last night.
"Our heart and heartfelt condolences go out to his family and loved ones in this terrible time, and we will comment later."
Sheffield English rock band formed in 2004 and has five members. Their music is mainly written in the genres of metalcore and alternative rock.
Crowds at their concerts often contain mosh pits – where smaller groups jostle against each other, often with force.
The site went to Twitter and said, "There was a medical incident at Last Night's Bring Me The Horizon concert, and our thoughts and condolences go out to the family of this individual and we wish him express our deepest sympathy.
"We hope you will understand that we can not provide any other comment at this time."
A cause of death has yet to be confirmed, but in the aftermath of the tragedy, many turned to social media to pay tribute to Ali Mills of Cheshunt, on the border between Essex and Hertfordshire.
One of them said, "Rest In Peace Ali Mills." What a tragic way out, to see your favorite band play a sold-out concert with the entire scene rocking.
"It could have been any of us, the pits were so crazy this Friday, stay basque, dude.
A spokesman for the London Ambulance Service said that the man had died on the scene.
They said: "We sent an ambulance attendant, an ambulance attendant in a rapid response car, an advanced paramedic and our hazardous area response team to the scene.
"Our first doctor arrived in less than three minutes."