Police are trying to find a laptop belonging to murder victim Julie Davsion.
The 50 year old was found dead at her flat in Whitby on April 25.
Officers investigating her murder think the laptop may be in the Leeds area. They are urging anyone who may have been offered a silver and black Toshiba C660/C6660D laptop for sale to contact them.
North Yorkshire Police officers are handing out leaflets in Leeds today to help find the laptop.
"The laptop is missing from Julie's home and it is extremely important that it is located as soon as possible. Even if you didn't buy it, but have been offered a Toshiba laptop for sale, please contact us."
Detective Chief Inspector Steve Smith, North Yorkshire Police
Police have released a photograph of a man they want to speak to about two murders, including that of Julie Davison in Whitby.
On Monday 23 April 81 year old Colin Dunford was found dead at his home in Middlesborough. A post mortem examination found he suffered serious head injuries as a result of an assault.
On Wednesday 25 April 50 year old Julie Davison was discovered at her flat in Whitby with serious head injuries.
Police are now trying to find 35 year old James Allen in connection with both murders.
He is known to police and they are advising anyone who comes into contact with him not to approach him, but to call the police immediately. He is described as 5 foot 7 with a bald head and tattoos on both arms.
Crime Scene Investigators remain at the flat in Whitby where the body of a woman was found. She has been named as 50 year old Julie Davison. Her sister discovered her with head injuries and paramedics pronounced her dead at the scene.
Police have described it as a "brutal murder" and are looking for a man with a dark coloured mountain bike.