Cheriff Tall was shot in Moss Side, Manchester early on 21 June 2020.
The 21-year-old was shot in the head at a party which was attended by up to 400 people.
It is believed Mr Tall was involved in an altercation with the gunman.
Three gunshot cartridges were found at the scene and he tragically died shortly after arriving at hospital.
Mr Tall’s sister Khadija wrote: “There’s an emptiness that our family and some of your friends feel that means nothing will ever be the same again.”
Police have appealed for help to catch his killer, who remains at large.
Supt Mark Dexter said officers had knocked on hundreds of doors, spoken to more than 400 witnesses and viewed hundreds of hours of CCTV footage, but needed help to find the “missing piece of the jigsaw”.
Det Ch Insp Stuart Wilkinson added: “These families have been through so much and deserve to see this criminal pay the price for the destruction and distress he has caused to their lives.”