The identity of who killed Sully at the end of Top Boy remains officially unknown and is left as an unanswered question by the show. In the final scene, Sully is shot by a mysterious figure in a black hoodie while sitting in his car, but the killer's face is never revealed
. Several main suspects and theories have been discussed:
- Stef : He had a strong motive since Sully killed his brother Jamie in season 4. Stef confronts Sully with a gun but ultimately decides not to shoot him. The killer's clothing resembles Stef's, so some speculate he may have returned to kill Sully after sparing him initially, but this is not confirmed
- Jaq or Erin : Since Sully killed Dris (Erin's father and Jaq's partner), they might have hired a hitman to take revenge, though they are not seen as the direct shooter
- Irish gangsters (the McGees) : Sully and Dushane killed two Irish gangsters earlier in the season, which could have led to retaliation by their crime family
- Si or Bradders and co : Rival gang members who had conflicts with Sully could have motives, but there is less evidence pointing directly to them
The show deliberately leaves the killer's identity ambiguous, emphasizing the brutal and unpredictable nature of the criminal world portrayed in Top Boy
. In summary, Sully's killer is never explicitly revealed, and the show ends with a cliffhanger, leaving viewers to speculate among the main suspects: Stef, a hired assassin possibly linked to Erin or Jaq, the Irish gangsters, or other rivals
