Police investigating the death of young father Tommy Main have appealed for anyone at a party with him on Saturday night to come forward.
Anyone who was filming or taking pictures are also asked to contact police.
The 23-year-old was at a party in a house in The Nursery when he collapsed and died after reportedly taking part in a 'Punch4Punch' game with another man.
The former Erith School pupil suffered a cardiac arrest and while emergency services tried to save him he sadly died at Darent Valley Hospital in the early hours of Sunday morning.
Detective Inspector Michael Norman, who is leading the investigation, said " Tommy's death is being treated as unexplained but I would urge any of his friends who were at the party on the night of his death to make contact.
"I am especially interested in any images or footage from the night of his death."
Brother Benjamin wrote online: "Tommy, I love you so much boy.
"I'm a broken man without you here with us. I'm going to miss you so much baby bro."
Brother Roy slammed the "so called friends" at the party for filming the punching game.
He said: "I had to say goodbye to my little brother today for the last time.
"I'm hurting so bad, I'm so sad I love you Tommy Main."
A tribute page was set up by best friend Matthew Davey and attracted more than 2000 'likes' since the weekend.
Mr Davey and friends are setting up fundraising events to raise money for Mr Main's family and young daughter.
Mr Main's Facebook page is flooded with pictures of his young daughter Aimee, four, whom friends say he doted on.
A friend, who didn't want to be named, told News Shopper Mr Main was taking part in a 'punching game' which went wrong.
A 20-year-old man was arrested on suspicion of murder and has been bailed until late September.
Anyone with information is asked to contact officers on 0208 721 4961. If you wish to remain anonymous please call Crimestoppers on 0800 555 111.
For more information on fundraising for the Main family visit facebook.com/pages/Tommy-main/491208827678801