There are "a whole series of reasons" why a man accused of murder would "want payback," a prosecutor told a jury this morning.Antonio Myers is alleged to be a high ranking member of the Middletown gang who shot Kumi Harford, a high ranking member of the 42 gang, in the early hours of December 5, 2009. He denies murder and using a firearm.His two-week Supreme Court trial has heard evidence that the victim attended a party at Devonshire Recreation Club just an hour-and-a-half before he was shot dead on St Monica's Road.At that time, according to Crown witness Mandaya Thomas, a man named David Cox was involved in a drink-throwing altercation with a woman named "Neika".According to Police gang expert Alexander Rollin, "Neika" is the mother of a Middletown gang member, Yusef (JuJu) Williams, and the aunt of one of Antonio Myers' two girlfriends, Rogernae Lightbourne.Sgt Rollin explained "Neika" lived in a house in Middletown where the gang associated with that neighbourhood is known to congregate, including Mr Myers.Sgt Rollin told the jury about the ongoing feud between the Middletown gang, which is allied with the Parkside gang, and the 42 gang. He said this is linked to numerous killings.He added that in the gang mentality, an attack on one member is perceived as an attack on the gang as a whole.Ms Thomas said when she saw Mr Harford, 30, in St Monica's Road later that night, she warned him to get off the street because of the incident that had unfolded at the club. However, he was shot dead a short time later as he sat in his car.When he opened the trial last week, Director of Public Prosecutions Rory Field said there was a direct link between the incident at Devonshire Rec and the shooting around 90 minutes later.Today in his closing speech, he said of the alleged motive for the murder: "There are a whole series of reasons for the defendant, who wanted some payback. To do something for his new girlfriend Rogernae, his new girlfriend, because he's in the process of swapping from his baby-mother to Rogernae."He's got the insult to the woman whose house he hangs out at. And there's the general rule that when you attack one person, you attack the whole gang. So he's got lots of motive to want to sort something out. To do payback."Mr Field is currently continuing his closing speech in the case, and his remarks will be followed by a closing address from defence lawyer Jerome Lynch QC.The jury is expected to consider a verdict in the case on Monday.