Young dad Tommy Main was killed by a single punch at a birthday party in Erith after exchanging "man banter", a court heard.

The 23-year-old collapsed to the floor after he was hit in the upper chest by Desmond Bartley, 21, as the pair traded jabs at the party in The Nursery on June 28 last year, jurors heard.

Inner London Crown Court heard the blow caused the father-of-two's heart to stop functioning properly, resulting in his death.

Sam Gallet, who organised the party, said the pair traded jabs after her son was given "the birthday beats" in the back garden.

She said: "They were having a conversation. They had been to the gym and beefed up and were looking at each other and their muscles in a man banter way.

"After that they just carried on chatting and then they just punched each other in a sort of man way."

The witness, who broke down giving evidence when shown pictures of her dining room from the night Mr Main died, said the alleged victim hit Bartley first.

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Desmond Bartley is accused of manslaughter

She said: "He laughed and called him a pussy.

"Des told him to take another shot.

"It was then Des' turn. He just took the punch."

She said Bartley threw a "full pelt" punch that landed on Mr Main's chest area.

Prosecutor Jonathan Rees asked: "Did he react in any way?"

The witness replied: "Yes, 'corr, that was a good'un'."

Ms Gallet said there was a pause, and then: "Tommy went straight forward onto the floor by my feet and started snoring.

"That was the noise coming out of Tommy when he dropped."

She told the court there was no animosity between the two that evening and neither of them seemed that drunk.

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Tommy Main

The alleged victim's father, removal man Mick Main, described the chaotic scenes after he was awoken when his son collapsed to the floor.

He said in a statement: "There was commotion outside my door and under my window. People were banging and shouting 'Mick, come quick'.

"Someone said: 'Tom's down, he's not breathing'.

"I was calling for an ambulance, but I didn't think for a minute it would be fatal."

He added: "As I went into the room it was chaos."

Mr Main described his son, the youngest of four brothers, as a "popular person" and a "good dad" to his two young daughters.

Bartley, of Elm Grove, Erith, denies manslaughter.

The trial continues.