Kit's murder in Top Boy S4 explained in detail.
SCREENRANT VIDEO OF THE DAY SCROLL TO CONTINUE WITH CONTENT Summary Kit's sudden twist of fate in Top Boy season 4 triggers many changes in the show's overarching storyline — here's an explanation for who killed him and why. As the second in command for Jamie, Kit always seems to look up to him and follows his orders without ever questioning his motives. Even when Jamie gets a prison sentence, Kit holds the responsibility of taking care of his two brothers.
After Jamie gets released from prison in season 4, Kit is the first to show up at the courthouse to receive him and celebrate his freedom. Unfortunately for Kit, his loyalty to Jamie becomes his biggest weakness when it leads to dire consequences in Top Boy season 4. While his trust for Jamie never falters throughout his narrative in Netflix's Top Boy, Jamie gets embroiled in a sticky situation that ultimately results in Kit's death.
When Dushane and Jamie set out to find Ats' killer in season 4, their search leads them to a CCTV footage, which helps them determine that Kit had called the shots on Ats' murder. Kit makes the mistake of coming clean to Jamie about his involvement in Ats' murder, as Jamie later snitches on him and reports his confession to Dushane. To test his loyalty, Dushane asks Jamie to kill Kit.
Although Top Boy does not explicitly mention Sully's motives for killing Jamie, his actions could also be driven by his jealousy towards the fact that Dushane wanted Jamie to take over Summerhouse after him. Ultimately, in Top Boy season 5, the chain reaction of events triggered by Kit's death leads to Sully killing Dushane before he himself meets a similar fate.