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.
Yekaterina Litvinenko died in 1997, in Kiev, Ukraine.
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 was born on November 7, 1921, in Ukraine.