This is the first picture of a young woman who was found dead in the back garden of a house two days after she was reported missing.
Sandra Zmijan, aged in her early 30s, was discovered in the garden at a property in Hayes on Monday morning, police said.
Scotland Yard said Ms Zmijan, from Southall, had been reported missing two days earlier on Saturday.
Officers released her name and photograph on Wednesday and have urged witnesses to come forward.
Police are appealing for anyone who saw her after 8pm last Thursday to come forward. It is believed she used public transport to travel from her home in Southall to the Whittington Road that evening.
A 26-year-old man was arrested at a hospital on Saturday on suspicion of murder and remains in custody, Met officers said.
The woman's next of kin have been informed, they added.
The incident was the fourth killing in the capital in as many days and comes shortly after the number of homicides in London reached 100 for the year.
"We are very keen to hear from anyone who thinks they may have seen Sandra from Thursday evening onwards so we can piece together her movements," said Detective Chief Inspector Simon Harding.
"We have made an arrest in connection with this incident but would urge anyone with information to call the incident room on 020 8721 4205 or call Crimestoppers anonymously on 0800 555 111."
