Detectives are investigating following the death of a man and woman on Thursday, 10 October.
Police were called to a residential address in Ambleside Road, Brent at 12:07hrs following reports of a death at the property.
Officers attended and found a woman, believed to be aged in her 20s, deceased. Police are in the process of informing her next of kin.
A post-mortem examination will take place in due course to establish the cause of death. Formal identification awaits.
At 12:19hrs on Thursday, police were informed by British Transport Police of the death of a man on the underground at Green Park. His death is not being treated as suspicious.
Formal identification awaits. The man, aged in his 30s, was known to the woman found dead in Ambleside Road and as such the two incidents are believed to be linked.
Enquiries into the full circumstances continue.