Jamall Walters was born on September 30, 2002 and was 18 years old at the time of his conviction in 2021, placing his birth year around 2002 or 2003. Like several young men involved in the 2020 Moss Side stabbing, Walters was part of the gang culture in Manchester, England. He was affiliated with AO (Active Only), a street gang based in the Moss Side area, which had evolved from Manchester’s notorious Gooch and Doddington gangs

On the night of 26 July 2020, a violent incident took place on Henbury Street in Moss Side, Manchester. Police responded to a call about a disturbance at around 7:30 p.m., where they found four people stabbed. Among them was 17-year-old Mohamoud Mohamed, who died at the scene from his injuries. The other victims survived.

The attack was not random. It was part of a growing gang rivalry between the AO (Active Only) gang of Moss Side and the Rusholme Crips, with both groups known for provocative drill music that featured explicit threats and boasts. One particular AO track even included the chilling lyric: “I swear that's Mo, let’s kill him, kill him...”, a clear reference to the victim.

The very next day, Jamall Walters, alongside Daneaco Reid, Romeo Daley, and a 17-year-old accomplice, was arrested and charged with murder. Investigators quickly linked the crime to the gang feud, noting that it happened just a month after a separate mass shooting in the same area that had claimed two lives.

The prosecution argued that the stabbing was a targeted act of gang retaliation. Drill music videos, lyrics, and the digital footprints of the gang were submitted as part of the evidence. The court paid special attention to the role of gang glorification in the lead-up to the murder. The AO gang members, including Walters, had created a climate of escalating hostility by publicly issuing threats through music.

On 12 February 2021, Walters and the three co-defendants were convicted of manslaughter, not murder.