vanessa santillan was found dead at a flat in fulham , south west london .
the 33-year-old mexican national was working as a transgender escort .
a 23-year-old man was arrested in connection with her death last month .
he was bailed pending further inquiries as police continue investigation .
any witnesses or anyone with any information that can assist police are asked to call the incident room on 020 8721 4868 or contact crimestoppers anonymously on 0800 555 111 or via crimestoppers-uk.org .