Shauna McDevitt, 47, from Derry, was killed in a car accident on the Toome bypass on Sunday.
Just after 11 p.m., the crash occurred.
Officers from the Incident Investigation Unit in Sprucefield would like to hear from anyone who was in the area at the time and may have witnessed the collision, or who may have dash-cam footage that could help with their investigation, by calling 101 and using reference number 1864 10/04/22.
Alternatively, you can use the non-emergency reporting form at http://www.psni.police.uk/makeareport/ to submit a report online. You can also call Crimestoppers on 0800 555 111 or submit an anonymous tip online at http://crimestoppers-uk.org/.
A man in his 50s is still being held in custody, assisting officers with their investigations.