Officers are treating his death as unexplained and are carrying out an investigation to determine how he died and the circumstances that led to his death.
As part of those enquiries, detectives are appealing to anyone who may have seen or heard from Mr Illingworth between 11.45pm on the night of Saturday 5 December and 6.40am on the morning of Sunday 6 December 2015, to contact them.
Police also want to locate a bicycle that Mr Illingworth uses which is described as a silver coloured, ladies’ mountain bike. If you have found a discarded bike or know where the cycle is, please contact the police.
Please quote reference number 12150216162 when passing on information.