A fourth man has been arrested in connection with the murder of a father-of-two who was shot outside his Nottinghamshire home eight years ago.
David Draycott, 40, of Woodlands Way, Sutton in Ashfield, was shot several times on 7 October 2002.
He died four days later in King's Mill Hospital.
A 36-year-old man from Sherwood, Nottingham, was arrested on Monday morning on suspicion of murder and remains in police custody.
A 54-year-old man arrested at HMP Whitemoor on Thursday is no longer being questioned by police. Two men were also held, but released in April.
Mr Draycott, who was a businessman, had just arrived home when he was shot.