Political allies of Aleksei A. Navalny said on Saturday that his mother had received an official notification of his death.
Mr. Navalny's spokesperson, Kira Yarmysh, stated in a statement on X that Russian investigators had moved Mr. Navalny's body from an Arctic prison colony to the neighboring town of Salekhard, where it is currently undergoing examination.
In her statement, Ms. Yarmysh stated, "We demand that Aleksei Navalny's body be released to his family immediately."