Police said the man they have named that they want to speak to over the "brutal" murder of a mother-of-two at her home, had been in an "acrimonious" relationship with her.
Michael Cope, 28, had a turbulent love life with Linzi Ashton, 25, and had been the subject of previous police contact, Greater Manchester Police said.
Detective Chief Superintendent Darren Shenton said:
It is an early stage of the investigation and I am not going to speculate as to to the cause of Linzi's death. However, I am satisfied that she has been brutally assaulted.
Michael Cope and Linzi had been in a relationship. That relationship has been acrimonious and indeed the subject of reports to the police.
A young woman has been brutally murdered. I believe the person responsible is this local man Michael Cope and I need the public's support to locate and actually provide information which will allow the police to arrest Cope.
Cope himself can surrender to the police and contact any local police officer or police station but I give this caveat to people who may know Cope and may be harbouring him - I would take a particular dim view of anybody who provides assistance to Cope knowing that he is being actively searched by police in connection with this murder.
More top news
Bubba the terrier-mix puppy was packed off to kick his drug habit after living with addict owners - but is well on the way to recovery.
Human remains from found at the crash site of EgyptAir flight MS804 point to an explosion on board the plane, an Egyptian official has said.
Birmingham Children's Services are to be taken over by a voluntary trust following years of failings.