The man suspected of murdering Linzi Ashton was already wanted by police on suspicious of raping her, Greater Manchester Police said.
Ashton accused Michael Cope of rape in April and Superintendent Kevin Mulligan said police had been seeking to arrest him since then.
Mother-of-two Ashton, 25, was found dead at her Salford home on Saturday.
More top news
Two doctors have been charged after a 30-year-old woman died while having an emergency caesarean.
Janet Faal was left badly injured after leaving the house for only the third time in ten years.
More than 100 small business owners say they support Ukip's policies to help small traders in a letter published in the Daily Express.