A second woman has been charged with murder over the stabbing of the businesswoman Sadie Hartley.
Katrina Walsh, 55, was charged at Blackburn Crown Court - a day after Sarah Williams, 34, for the same crime.
It is understood Williams, who works for a ski travel firm, is a friend of the other suspect.
The mother-of-three was found dead in the hallway of her home in Rossendale, Lancashire.
Police are investigating whether a "love-triangle" could provide the motive for what they described as a "ferocious" knife attack.
Ms Hartley, 60, was a director at Hartley Taylor, a medical communications business based in Knutsford, Cheshire.
A Lancashire Police spokeswoman told the Telegraph: "I can confirm we are looking into the possibility of a love triangle as a line of inquiry.
"We have two people who are being investigated and while we can't confirm anything further about them,
"I can say we have reason to pursue this idea of Sadie being caught up in a love triangle."
A post-mortem found Ms Hartley died from multiple stab wounds with her body showing evidence of defensive wounds - suggesting she had tried to fight off her attackers.
Ian Johnston, Ms Hartley's long-term partner, said in a statement: "Sadie was a wonderful mother, sister, partner and friend.
"We are all utterly distraught following her senseless, brutal murder."