Sabrina Mullings, 38, was stabbed to death at her home in Upper Norwood on 13 March 2017.
Police and paramedics were called to the flat in Ravensdale Gardens at around 6am.
Ms Mullings was pronounced dead at the scene at 6.48am.
Later that day at 4pm her 23 year-old partner was arrested on suspicion of murder after being found with stab injuries in Walworth Road, Southwark.
Ivan Griffin, 23 (03.06.93), of Ravensdale Gardens, Upper Norwood, was charged with murder on 17 March 2017.
He is due to stand trial at the Old Bailey on 4 September 2017.
The Homicide and Major Crime Command led by Detective Chief Inspector Will Reynolds are investigating.
Anyone with information is asked to call the incident room on 020 8721 4005, or contact Crimestoppers anonymously on 0800 555 111 or at crimestoppers-uk.org.