in moscow. zain? >> this is indeed a mystery. so many questions surrounding this man's death, boris nemtsov. but some people have said because nemtsov was half jewish- and because he supported the cartoonists, that perhaps muslim extremism, islamic extremism is to blame here. that theory gaining much traction there? >> well kadyrov, the chechen president in his statement did point out that zaur dadayev, the former police officer had perhaps been upset about the paris shootings, the massacre at the offices of the cartoon, "charlie hebdo" in france. supporters members of his political party which often came out in criticism of the kremlin, they very much question this there is a lot of skepticism