Primary school teacher Sabina Nessa was murdered as she walked to meet a friend on Friday evening.
Here is a timeline of events leading up to the arrest of a 38-year-old man on Thursday.
Saturday evening: A man in his 40s is arrested on suspicion of murder at an address in Lewisham, and is later released under police investigation.
Monday September 20: A post-mortem carried out at Greenwich Mortuary proves to be inconclusive.
Monday, 9pm: The victim is identified publicly as Ms Nessa.
Lisa Williams, head of the Rushey Green Primary School, pays tribute to her, saying: “She was a brilliant teacher; she was kind, caring and absolutely dedicated to her pupils.
“She had so much life ahead of her and so much more to give and her loss is desperately sad.”
Wednesday September 22: Ms Nessa’s cousin Zubel Ahmed says that her family is “inconsolable” following their loss.
In an interview with the BBC he says: “We are all truly devastated. Her parents are absolutely shocked, they’re inconsolable still and understandably so, to hear of their daughter being taken away from them by some cowardly man is just horrific.”
Friday 24 September: Police release CCTV footage of a man they want to speak to putting his hood up close to the scene where Ms Nessa was discovered.
Sunday 26 September, 3am: Man, 36, was arrested in Eastbourne on suspicion of the teacher’s murder and taken into Met police custody.
Monday 27 September: 36-year-old Koci Selamaj charged with murder.