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
Police have been forced to close down motocross event near Sedgefield after one rider was killed and another seriously injured.
A woman hit by police gunfire during a counter-terrorism operation has been arrested after being released from hospital.
Police have been granted extra time to question a man who is being held on suspicion of planning a terror attack.