Five arrests have been made over the killing but nobody has yet been charged.
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Ahmed Farrah is wanted over the fatal stabbing of 21-year-old Kavan Brissett, who was attacked off Langsett Walk, Upperthorpe, in August 2018 and died four days later. Farrah is believed to have been injured in the same incident but has gone to ground.
With his killer still roaming the streets, here are a number of other men from, or with links to Sheffield, who are wanted by the police over other murders.
Abdi Ali, 29, has been named as a prime suspect in the murder of 47-year-old Shaun Lyall, who was attacked in his home in Cleethorpes in July, 2018. He was born in Somali, moved to Sheffield as a child, and has connections to Pitsmoor and Shirecliffe.
Anyone with information about any of the cases should call either South Yorkshire, Humberside or Cleveland Police on 101.
Ahmed Warsame, 31, is wanted over the murder of 22-year-old Jordan Thomas, who was shot dead in Sheffield December 2014. One man was jailed for 36 years but detectives believe others were involved.
Jamal Ali, 30, is wanted over the fatal shooting of 22-year-old Jordan Thomas, who was gunned down in a car on Derek Dooley Way, Sheffield, in December 2014. Although one man was jailed, police believe others were involved in the killing.
Mohammed Ali, 33, is wanted for questioning over the murder of 22-year-old Jordan Thomas, who was shot dead in December 2014 in what is believed to have been a gang feud. One man was jailed but others are believed to have been involved.
Saeed Hussein, 30, is wanted over the shooting of Jordan Thomas, 22, who was gunned down in a car in what is believed to have been a revenge attack in a gang feud. Police believe some of those involved fled to Somalia.
Albanian national Eugert Merizaj, 28, who has links to Sheffield, is believed to hold vital information about the murder of a Kurdish sniper who fought against the Islamic State.
Father-of-two Hemwand Ali Hussain, 30, was shot dead in a property in Hartlepool, on September 15 last year.
Albanian Qazim Marku, 23, is wanted over the murder of a Kurdish sniper who fought against the Islamic State. Hemwand Ali Hussain, a 30-year-old dad-of-two, was shot dead in Hartlepool, in September last year.