A woman, aged 65, has been arrested on suspicion of murder and remains in custody at a north London police station.
Detective Chief Inspector Matt Bonner of the Homicide and Major Crime Command leads the investigation.
Any witnesses or anyone with information is asked to contact the incident room on 020 8358 0200 or call Crimestoppers anonymously on 0800 555 111
More top news
Luton-born Natalie Crichlow, 44, was visiting family in the West Indies when she was allegedly attacked by an unknown intruder in a bedroom.
Payne said the London event had been cancelled due to bad weather.
Work began on the project ten years ago and it should have been ready last year.