Detectives investigating the murder of Gerald Corrigan want to trace the drivers of three vehicles.
They were seen travelling on Porthdafarch Road in Holyhead between 11pm on Thursday 18th April and 1am on Friday 19th April – around the time of the crossbow shooting.
Mr Corrigan (74), a retired lecturer, died from his injuries at the Royal Stoke University Hospital on 11th May. He was fixing a satellite dish at his home near South Stack Road when he was shot.
Terence Whall (38) from Bryngwran has already been charged with murder and is on remand in custody until next month, when he is due to enter a plea. His defence has indicated he would deny responsibility.
Three men have been charged with conspiracy to pervert the course of justice by torching a Land Rover vehicle linked to the murder. Gavin Jones (36) of Bryngwran, Darren Jones (41) of Bangor and Martin Roberts (34) of Bangor will appear before a judge later this month.
Anyone with information should contact the major incident room at Llangefni CID on 101, quoting Operation Blue Fulgent, or Crimestoppers anonymously on 0800 555 111.