The woman found dead in a house in Teesside has been named as Christine Henderson.
Ms Henderson was discovered in an address on Cherwell Terrace, Middlesbrough.
She had recently lived in the Hartlepool area.
A post mortem concluded the 50-year-old died of stab wounds.
Police continue to question a 47-year-old man in connection with the incident.
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The constituency of Washington and Sunderland West includes the UK's largest car plant, which was opened by Nissan in 1984.
This seat was formed prior to the 2010 General Election, taking in Sunderland city centre and the Ryhope area to the south.
The constituency of Stockton South includes relatively affluent areas like Yarm and Eaglescliffe.