A father-of-two died after he was sucker punched when he tried to break up a street fight between two strangers in California.

Adam Valles was with his wife and some friends when he observed a bar fight spill out onto the streets in downtown Riverside, California, last Saturday morning.

Although Valles, 29, didn't know the men involved, he attempted to calmly break up the scuffle but he was 'tackled' to the ground, hitting his head against the pavement.

The father was trying to raise himself up when another person punched him in the face, causing his head to slam against the ground again.

Valles was rushed to a nearby hospital, suffering a brain hemorrhage and he was in a coma for five days before he died on Thursday.

Now, police have released footage of the fight in attempt to track down the men who reportedly attacked Valles and caused his senseless death.

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Adam Valles, 29, died on Thursday after he was 'sucker punched' when he tried to break up a street fight in Riverside, California, last Saturday. The father-of-two suffered a brain hemorrhage in the attack and was in a coma for days

Valles' wife and high school sweetheart, Johana Cordova Valles, (pictured together on their wedding day) said: 'Adam is a great husband and an amazing father, he always put others needs before his own'

Valles' wife, Johana Cordova Valles, is raising funds for her husband's funeral through GoFundMe, saying they were high school sweethearts.

Speaking of the attack, she wrote: 'We saw a man getting jumped by four men and my husband calmly broke up the fight, after he did that he went to help the man on the floor.

'That's when someone tackled him to the ground and he hit his head, once he got up someone else punched him which caused him to fall and hit his head again. That was the last time he got up.

'Adam is a great husband and an amazing father, he always put others needs before his own.

'Adam I love you baby, You will be in my heart always. Don't worry about the babies, I'll take care of them. I will make sure that know their daddy died a hero. I love you.'

Valles was a father to an eight-year-old daughter and four-year-old son.

Police released surveillance video of the attack in attempt to track down two suspects who are allegedly responsible for causing Valles' death. They were seen knocking him down and punching him after running across the street (pictured)

Valles was 'tackled' to the ground, hitting his head against the pavement. He was then punched in the face, causing his head to slam against the ground again. Pictured: Valles in a coma (left) and with his four-year-old son (right)

Rosalie Valles, the victim's daughter, said to NBC Los Angeles: 'He saved two people and I want them to know I miss him and I want him to come back.'

Police are still searching for the two men in the video, releasing surveillance footage and a Snapchat video in hopes someone with information will come forward.

One suspect was wearing dark shirt with skinny jeans and the other was wearing a light blue button up shirt and tan pants.

Officials believe they came from one of the bars across the street, reported KTLA.

Johana Valles added to NBC Los Angeles: 'My kids should not go without a father because of some idiot. I hope we catch him. Adam needs justice.'

She said to KTLA: 'You were there please come forward. Give us closure; we need it.'