A man has been arrested on suspicion of the murder of primary school teacher Sabina Nessa in south-east London, in what police described as a “significant development”.
The body of Ms Nessa, 28, was found in Cator Park, Kidbrooke, on 18 September.
A 38-year-old man was arrested in East Sussex at about 03:00 BST.
Footage was released of a man filmed walking through Pegler Square on the night Ms Nessa was attacked on 17 September.
Police believe the 28-year-old was murdered as she made her way to meet a friend at a pub in southeast London.
Officers investigating the killing said she left her home on Astell Road and walked through Cator Park at around 8.30pm last Friday towards The Depot bar in Pegler Square, Kidbrooke Village, when she was attacked.
Her body was found the next day by a member of the public near a walkway in the park.
A post-mortem examination into the cause of Ms Nessa’s death was inconclusive.
Two other men were previously arrested on suspicion of Ms Nessa’s murder but later released pending further investigation.
Ms Nessa’s family has been informed of the latest arrest.