POLONIUM-210
It was the element Polonium :) does that help?
We don't know at this moment in time, as there are many suspects
A post-mortem examination suggested Mr Litvinenko had died after being poisoned with the radioactive substance polonium-210.
Alexander Litvinenko's birth name is Alexander Valterovich Litvinenko.
Alexander Litvinenko was born on August 30, 1962.
Alexander Litvinenko was born on August 30, 1962.
Oleg Litvinenko died on 2007-11-19.
Oleg Litvinenko was born on 1973-11-23.
Irina Litvinenko Ektova was born in 1987.
Alexei Litvinenko was born on 1980-03-07.
Yekaterina Litvinenko died in 1997, in Kiev, Ukraine.
Yekaterina Litvinenko was born on November 7, 1921, in Ukraine.