Police are questioning a woman in connection with the death of a 60-year-old respected businesswoman who was stabbed to death in her home on Friday night.
Lancashire police said in a statement that the body has yet to be formally identified but is believed to be that of Sadie Hartley.
Police found her body with "multiple stab wounds" at her home in the leafy village of Helmshore, in the Rossendale valley, Lancashire.
A 34-year-old woman from Chester was arrested on Saturday on suspicion of murder and remains in police custody.
A colleague at the medical communications firm where Hartley worked raised the alarm on Friday evening at 10.40pm after Hartley failed to show up for work or to contact the office on Friday.
She was last seen at a conference in Manchester on Thursday 14 January and spoke to a colleague at about 7.30pm that evening.
Police are investigating CCTV footage from Thursday which shows an "old-style" Renault Clio driving into Sunny Bank Road at 8pm.
The CCTV footage also shows a man walking out of the road towards Helmshore village around the same time, as well as a jogger running the opposite direction – police say both could hold clues to the incident. Police want the driver of the Clio and the other people on the footage to come forward.
Detective Superintendent Paul Withers of the Lancashire police told reporters at the house on Sunday that it may not have been a random attack.
The Guardian reported that he said: "I don't think this was a random attack, albeit I am not dismissing anything at this time. I think our deceased has been targeted.
"I think the person responsible had issues with Sadie, for whatever reason."
Withers described Hartley as a "thoroughly decent lady" who didn't deserve what he called a "really vicious attack".