Police are appealing for information after the death of a man who was found unconscious in Northumberland.
Mathew O'Donovan, 22, died in hospital after being found on a disused mineral line in Ellington on July 5.
A man has been arrested in connection with the incident and released on bail.
Northumbria Police Motor Patrols Sergeant, Mick Soulsby, said:
– Sergeant Mick Soulsby, Northumbria Police
"A motorbike was located nearby and one possibility is that he has fallen off a bike, although there may be another reason.
"His family are devastated at his death and we want to be able to give them the answers they need to help them come to terms with such a tragic loss at this difficult time."