Police are appealing for information following the murder of a woman in Hayes.
Officers were called at 09:38hrs on Monday, 24 September, following concerns for the welfare of a missing woman.
The body of a woman, aged in her early 30s, was found in the back garden of the house.
Formal identification is yet to take place but police are confident the deceased is Sandra Zmijan, from Southall, who was reported missing on Saturday, 22 September.
A post-mortem examination will be carried out on Wednesday, 26 September.
A 26-year-old man, who was known to the victim, has been arrested on suspicion of murder and is in custody at a south London police station.
Officers have now released a photograph of Sandra and are appealing for anyone who may have seen her after 20:00hrs on Thursday, 20 September to come forward.
It is believed she used public transport to travel from her home in Southall to the Whittington Road area on the evening of Thursday, 20 September.
Sandra was of athletic, slim build and is known to have been wearing all black when she was last seen.
Detective Chief Inspector Simon Harding, said: "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.
"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."