The Police Ombudsman has described the death of a motorcyclist who collided with a police motorcyclist during a charity event as "a tragic accident".
The incident happened on the Garron Road near Larne on 19 April 2009, during a charity motorcycle rally involving over 1,000 motorbikes.
Al Hutchinson, whose office investigates all road deaths involving police, said the evidence suggested that the man - who was travelling in the opposite direction to the motorcycle cavalcade - had lost control of his machine as he came round a corner. He fell off and collided with a police motorbike at the head of the procession.
Three police motorbikes were travelling at the front of the rally, which was following a route from Carrickfergus to the North Coast, via Carnlough.
Police Ombudsman investigators attended the scene of the accident, which was forensically examined, photographed and mapped. Statements were taken from people who saw the collision, and police documentation was reviewed, including documents describing the police planning for the event.
Biker appeared to lose control as he rounded a corner.
Witness accounts, both civilian and police, were in agreement that the police motorcyclists had been on the correct side of the road and that the civilian biker had lost control of his machine as he rounded a corner.
Analysis of the scene suggested that the rider's view around the corner would have been restricted by trees and bushes.
Two police officers sustained non-life-threatening injuries in the collision.
Mr Hutchinson concluded: "All the available evidence, including a full forensic analysis, confirms that police officers leading the cavalcade were positioned correctly on the road and driving with due care and attention."
He concluded that no criminal or misconduct offences had been committed by any officer.