Sadie Hartley murder probe: Second arrest over 'targeted' stabbing
A second woman has been arrested on suspicion of murder after a woman was killed in a "targeted" and "ferocious" attack at her home.
Sadie Hartley, 60, was home alone when she stabbed in Rossendale in Lancashire on Friday.
The mother-of-three was found dead in the hallway of her house in Sunny Bank Road, Helmshore at about 22:40 GMT.
A 55-year-old woman from Chester is in custody. A woman aged 34 continues to be questioned on suspicion of murder.
A post mortem examination confirmed the cause of Ms Hartley's death was multiple stab wounds.
The businesswoman had spoken to a colleague at about 19:30 GMT on Thursday but there was no further contact before she was found dead on Friday.
Police are yet to find a weapon.
Det Supt Paul Withers said: "The exact motive for this horrific murder remains unclear at this time but we are continuing to make steady progress."