Armed police had been searching for a suspected crossbow killer after man was killed in his own home following an attack.
Police have now confirmed that they believe they have found the suspect dead in rural North Yorkshire.
Members of the public had been warned not to approach him and call 999.
The main suspect lived in the house next door, he has not been since the attack and in known to the police.
Humberside Police have named the victim as Shane Gilmer aged 30. The father of three and his pregnant partner were both found injured at an address in Southburn a rural village near Driffield.
Police were alerted to a disturbance at the property at about 9.20pm on Friday evening.
A crossbow was found within the house and police are now carrying out forensic tests on that weapon.
Shane Gilmer who worked for East Riding Council died at the Hull Royal Infirmary on Saturday following the horrific attack in his own home.
His partner Ms Sugden suffered serious injuries but these are non-life threatening both Sugden and her unborn child are in a stable condition.
Police have placed the villisge on lockdown as extensive police searches are carried out within the surrounding area.
A police helicopter has spent most of the day searching local woods.
Police are now appealing directly to Anthony Lawrence also known as Tony Howarth aged 56.
DCI Stewart Miller said “We can confirm that at around 6pm this evening (Sunday 14 January) officers discovered the body of a man believed to be 55 year old Anthony Lawrence, in a vehicle in a rural location in North Yorkshire.”
Lawrence lived on the house next door to the victims and has not been seen since the incident.
He is known to both of the victims and now a national man hunt has been launched.
Detectives are working to establish a motive for the attack.
His car a navy blue Vauxhall Meriva was found abandoned nearby.
Chief Inspector Andy Parsons urged him to turn himself in: “Avoiding speaking to us could only make matters worse for you in the long run.”
Police, who say Lawrence is known to them, are appealing for anyone who believes they have seen him to call them immediately.
Chief Inspector Parsons said: “While we still believe this was an isolated incident and there is no threat to the wider public, please do not approach him yourself.”
Officers are now making house-to-house enquiries, and there will be an increased police presence in the area over the next few days.
Lawrence is described as white, around 5ft 10in tall, balding with short dark hair and of large build.