A 20-year-old man, arrested on suspicion of murder in Woodstock, has been released without charge.
The man was arrested after police found the body of a man lying in the road in Cockpit Close at 3.30am yesterday.
A spokesman for Thames Valley Police said: "A post-mortem examination revealed the man died of natural causes.
"Therefore the incident is not being treated as suspicious."
A spokesman for South Central Ambulance said they had received a call at about 3.30am yesterday saying there was a man aged about 50 lying in the road.
Police officers set up a cordon at the scene as scenes-of-crime officers carried out forensic checks.
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