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He was working in a steamboat engine and it exploded. He survived the explosion, but his lungs were seared. He actually died because the doctor's inexperienced medical student gave Henry and overdose of a painkiller.

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12y ago
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Henry Clemens died on June 21, 1858, after a steamboat explosion on the Pennsylvania.

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Q: When did Mark Twain's brother Henry Clemens die?
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