A man captured on camera just minutes before a sexual assault may hold the key to finding the attacker, police said tonight.
Officers released CCTV footage of a man, right, seen crossing High Street, Wallingford, just 20 minutes before the serious assault.
The footage then shows the man walk over Wallingford Bridge towards where the attack happened.
A 21-year-old woman was sexually assaulted in an alleyway beside the recreation ground in Crowmarsh Gifford at about 2am on December 30.
Det Sgt Darren Cartwright, of South Oxfordshire CID, said: "This man may be a very important witness, then again he may have nothing to do with it, but it is vital we eliminate him from our inquiries."
No-one has yet been arrested in connection with the attack.
Anyone with information should call police on 08458 505505.
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