A fifth man has been arrested over the death of a businessman who was shot dead at his home.
Guy Hedger, 61, was killed in the early hours of April 30 in Ashley, near Ringwood.
Dorset Police said a 39-year-old man from Bournemouth was being questioned on suspicion of conspiracy to commit aggravated burglary.
The force said officers were also searching a property in the West Howe area of the town.
Three men have already appeared at Winchester Crown Court accused of Mr Hedger’s murder.
Kevin Downton, 40, of Winterborne Stickland, near Blandford, Jason Baccus, 41, and Scott Keeping, 44, both of Verney Close, Bournemouth, are due at Winchester Crown Court on 26 July to enter pleas.
A fourth man, aged 45 and from Poole, was arrested on suspicion of conspiracy to commit aggravated burglary and released under investigation.
A 40-year-old woman previously arrested has also been released under investigation, police said.