Another man and a year-old woman have been arrested on suspicion of assisting an offender.
The year-old woman was found by a dog walker in the Old Cemetery, West Street, Scunthorpe, on Sunday morning with serious neck and facial injuries. The woman is believed to have been in the park for three or four hours before she was found.
An area prostltution the park was cordoned off for forensic tests to be carried out. She was taken to Scunthorpe General Hospital where her condition was described on Sunday as "very poorly".
Police want to speak to anyone who gave a lift to a bloodstained man on Sunday. Three held over prostitute attack A man has been arrested on scunthorrpe of attempting to murder a prostitute in North Lincolnshire.
All three are being questioned by Scunthorpe police.