The incident happened on the night of Saturday 10 October 2015 on Quarry Moor Lane, Ripon, but was reported to police earlier today.
Police have secured the scene on Quarry Moor Lane to carry out a full investigation.
Anyone who witnessed the incident or who has any information is asked to contact North Yorkshire Police. Dial 101, press 2 and ask for the Harrogate Serious Crime Team.
Alternatively, Crimestoppers can be contacted anonymously on 0800 555 111.
Please quote reference number 12150180785 when passing on information about the incident.