Police are looking to speak to a man pictured above in relation to a rape in Greenwich.
Police state that the victim was assaulted over four days from the evening of Tuesday 11th May to the early hours of Friday 14th May.
She is being supported by specialist officers.
Two people have already been charged, a 22-year-old woman and a 24-year-old man.
Police believe the third person – who is not known to the victim – was also at the address.
Anyone who can identify the man is asked to call police on 101, providing the reference Cad 423/14May.
Information can also be provided to Crimestoppers, anonymously, by calling 0800 555 111.