During the late night of 25 August 2022, a 36-year-old man was arrested at his flat in Huyton on suspicion of the murder of Pratt-Korbel and two counts of attempted murder. On 30 August 2022, the two men were released. On 1 September,
Merseyside Police released CCTV footage of the gunman. On 4 September 2022 one man was arrested on suspicion of murder and attempted murder, and two others detained on suspicion of assisting an offender. On 7 September the suspects were bailed. On 8 September another man was arrested. A ninth man was arrested on 10 September 2022. On 29 September, police arrested 34-year-old Thomas Cashman on suspicion of murder. On 30 September, a man was arrested on suspicion of assisting an offender. On 1 October 34-year old Thomas Cashman was charged with the murder, two counts of attempted murder as well as two counts of possession of a firearm with intent to endanger life. 40-year-old Paul Russell was also charged with assisting an offender. The two men appeared at Liverpool Crown Court on 3 October. On 21 December 2022, Thomas Cashman appeared at Liverpool Crown Court via videolink from
HM Prison Manchester and pleaded not guilty to all five charges. Cashman had been apprehended after a tip-off from a former partner, who lived nearby and he had visited shortly after the murder. When she originally came forward to the police after hearing about the child murder on the news she was arrested on suspicion of assisting an offender, before police realised she held crucial information and was willingly cooperating. The woman also recounted overhearing Cashman saying something along the lines of "I've done Joey" to Paul Russell, her partner. Other evidence against Cashman was the existence of
CCTV which showed him circling the area where the attack on Nee would later take place, showing him driving around in his van on multiple occasions and walking around the area on foot. CCTV of the gunman that night also showed him wearing a pair of tracksuit bottoms that matched the style of and design of those worn by Cashman. However, the CCTV recorders themselves were missing. One of these guns was found by police to have been linked to two previous shootings in the area, one of which involved a previous attempt to kill Nee only two weeks prior to Pratt-Korbel's murder, for which Cashman was already considered a suspect. == Trial, conviction and sentencing ==