The 22-year-old woman, from Preston, was quizzed after a man was stabbed in the stomach in the early hours of Thursday morning – just after midnight.
Police and ambulance crews were called to a home on Geoffrey Street in Deepdale.
The 26-year-old man was taken to Royal Preston Hospital but was later pronounced dead.
Enquiries are on-going to establish how the man sustained his injuries.
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The woman has been given bail until August 31.