A 19-year-old man, Jake Fahri, was convicted in March 2009 of his murder and sentenced to life imprisonment with a minimum term of fourteen years.

[2] Mizen, who turned 16 years old the day before his death, was 6 feet 4 inches (193 cm) tall and 14 stone (89 kg).

On 19 July 2004, he was given a nine-month referral order for taking part in a gang knife-point robbery of a schoolboy at Falconwood railway station in Bexley, Greater London.

At approximately 11:30 on the morning of 10 May 2008, a day after his sixteenth birthday, Mizen was inside the Three Cooks Bakery in Burnt Ash Hill, south London, with his brother, Harry.

[4][5] Not wanting to lose face after picking the fight, Fahri went back into the shop and hit him with two plastic drink bottles.

Mizen staggered to the rear of the bakery and into a cupboard to shield himself from the possibility of Fahri returning, where his elder brother, Tommy, who was 27 at the time, found him.

Fahri was remanded in custody and stood trial at the Central Criminal Court on 11 March 2009 for the murder of Jimmy Mizen before Mr Justice Calvert-Smith and a jury.

On 16 January 2025, it was reported that Jimmy Mizen's mother, Margaret, had expressed shock that Fahri was trying to gain status for himself as a drill artist and had released a rap song that made specific references to the murder of her son.

The charity has worked with schools across the United Kingdom to help young people to make their local communities safer.

Mizen's parents, Barry and Margaret, were both appointed Member of the Order of the British Empire (MBE) in the 2014 New Year Honours for services to young people in London.