For the source text click/tap here: Sanhedrin 93
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Gemara on our daf relates that Bar Koziva ruled for two-and-a-half years and then approached the Sages declaring himself to be the Messiah. The Sages replied that the Messiah was expected to be able to judge based on smell (see Isa 11:1-3), i.e. that he would have a unique sense of truth and justice. Finding that he was unable to do so, the Sages rejected his claim and he was killed.
According to the simple reading of the Gemara it sounds as if the Sages themselves killed Bar Koziva, in contrast with the story that appears in various midrashim (Eikha and others) that report that he was killed by the Roman enemy.
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