A 36-year-old, since identified as Jimmy Ward, died at a traveller site in Calcutt after a shooting at around 8.15am on Sunday, August 2.
Police arrested a 35-year-old suspect in connection with the incident on Tuesday afternoon (August 4), officers have confirmed.
Two other men, aged 53 and 29, were also arrested on Tuesday on suspicion of assisting an offender, following a vehicle stop on the A419.
This takes the total number of people arrested in connection with the shooting to five, and all of these suspects remain in custody for questioning.
On Sunday, a 74-year-old man and a 42-year-old woman were arrested on suspicion of assisting an offender and possession of a firearm.
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A cordon remains in place at the site and an increased police presence is also in operation at the scene.
Police said this will continue to remain in place over the coming days while an investigation led by the Major Crime Investigation Team (MCIT) continues.
Members of the public have been urged to respect this cordon while officers work at the scene.
Senior Investigating Officer Detective Chief Inspector Phil Walker, from MCIT, said: “This is a significant development in our investigation.
“I can confirm that a man has been arrested on suspicion of Jimmy’s murder and is now in police custody, along with four other people on suspicion of assisting an offender.
“Jimmy’s next of kin have been informed of this development and my thoughts continue to be with them. They are being supported by specially trained officers.
“A scene and heavy policing presence remain in place at the traveller site in Calcutt while further enquiries are carried out. I continue to ask that this cordon is respected.
“I’d like to thank the local community for their support and patience since Sunday.
“We understand this incident has caused significant concern, so please consider speaking with officers about any information or concerns you may have.”
Following the shooting tributes have poured in for Jimmy, who leaves behind a wife and children.
He has been described as a “gentleman” and a “lovely legend.”
Anyone with information about the incident is asked to contact police on 101, quoting log 95 of August 2.
