The Incident occurred at a property on Phoenix Boulevard, York, on the evening of Sunday 20 October 2013, which left one woman dead and another fighting for her life.
A 25-year-old man from York, was arrested on suspicion of murder and attempted murder at around 2.20am on Monday 21 October 2013, at an address in York.
He is currently in police custody.
Detective Superintendent Heather Pearson, of North Yorkshire Police is leading the murder investigation. She said:
Although we have made an arrest in this case, If you have any information about the incident on Phoenix Boulevard, I urge you to come forward immediately, as you may have vital details that could help the investigation.
Anyone with information which could help officers progress this enquiry, should contact North Yorkshire Police on 101, select option 2 and ask for York CID. Alternatively, information can be emailed to firstname.lastname@example.org.
Or call Crimestoppers anonymously on 0800 555111, quoting reference number 12130182574.