A former EastEnders actress was murdered and dumped in a canal after attending a high-profile hospital opening ceremony, detectives have revealed.
Officers stepped up their appeal for information after the headless body found in London's Regent's Canal was confirmed to be that of Gemma McCluskie.
Her 35-year-old brother Tony remains in police custody for questioning.
Officers are reviewing CCTV footage of her attending the opening of the new Royal London Hospital, in Whitechapel, east London, last Thursday.
Detective Superintendent Fiona Mallon, who is leading the Scotland Yard investigation, said: "It is important that we piece together Gemma's movements from Wednesday, February 29 until the discovery in Regent's Canal in Hackney on Tuesday."
The 29-year-old was reported missing to police two days after going missing. Her limbless torso was found when a member of the public reported a suspicious object floating close to Hackney's Broadway Market.
Police divers are still searching for Miss McCluskie's remaining body parts.
Friends of Miss McCluskie had been carrying out searches for her across east London.
Former EastEnders co-stars Natalie Cassidy and Brooke Kinsella both appealed on Twitter for help in finding her.
The actress played Kerry Skinner in the BBC soap on more than 30 occasions in 2001.
Her character arrived in Walford as a friend of Zoe Slater and the great-niece of the late Ethel Skinner.