Alexander Smelov, 55, killed in his office in Yakutsk.
Proof that lions roamed northern Siberia in the age of the mammoths and woolly rhinoceros.
Evidence of the dinosaurs found at Teete locality in Yakutia, just 450 km south of the Arctic Circle.
Video and pictures show experts conducting initial autopsy on the extinct creature preserved by permafrost.
Tantalising studies now underway to establish if one of two carcases preserved by permafrost has traces of world's oldest mother's milk.
Exclusive pictures show autopsy on a four year old bison preserved in ice since ancient times.