Question: In what year did the physicist who founded the Committee on Human Rights in the USSR with Valery Chalidze and Andrei Tverdokhlebov die?
Sentence (from "Committee on Human Rights in the USSR"): The Committee on Human Rights in the USSR (Russian: Комите́т прав челове́ка в СССР ) was founded in 1970 by dissident Valery Chalidze together with Andrei Sakharov and Andrei Tverdokhlebov.
Relevant evidence: Yes