The body of Martine Vik Magnussen, 23, was discovered under rubble in a Great Portland Street basement in 2008.
Farouk Abdulhak, on the Met Police's most wanted list and is the subject of an international arrest warrant, has never spoken about the case before.
He told the BBC Vik Magnussen died as a result of a "sex accident gone wrong".I was a student myself when Martine's body was discovered, and I found the reports about it deeply shocking, especially as the main suspect in her murder was Yemeni - I am also from Yemen.
So when I joined the BBC as a journalist in 2011, it was one of the first stories I pursued. My main goal was to find answers for Martine's family, who regard her death as a test of international law. The UK has no extradition treaty with Yemen.
But it wasn't until last year that I finally managed to make contact with Farouk Abdulhak. My communication with him began over social media. Hundreds of journalists have reached out to him over the years and he has ignored them all. But our shared Yemeni background helped me gain his trust. Ten days after we first started texting, he sent me the first of what would turn out to be a series of revelatory messages.