Ms Hartley, who ran a medical communications business, was found dead in her detached, stone-built property on Sunny Bank Road, police said.
She was alone at the time, with her partner Ian Johnston, 56, an ex-fireman, abroad on a skiing holiday in the Swiss Alps. Police have said he is not a suspect.
Nothing was believed to be missing from Ms Hartley's home and there was no forced entry.
Ms Hartley suffered defence injuries as she fought back from the attack, launched possibly on her doorstep.
http://www.mirror.co.uk/news/uk-news/helmshore-murder-second-woman-arrested-7202011
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