He was killed by Shiva. He did great penance and obtained a boon from Brahma that he shouldn't be killed by Vishnu by any means. With that boon, he started harassing everyone. He imprisoned a couple who were Shiva's devotees and prevented them from worshipping Shiva. He wanted to kill them but his sword fell of the Shivalinga they were worshipping. Lord Shiva was furious and killed Bhimasura.
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