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.
He is Samuel Clemens a.k.a. mark twains older brother who died in infacy
Samuel Langhorne Clemens
It was Susy Clemens.
Susy Clemens, Mark Twains favored daughter.
The real name of the American author Mark Twain was Samuel Langhorne Clemens (1835 - 1910).
Mark Twains Father name was Samuel Clemons also.
Mark Twain was the 'pen-name' of Samuel Langhorne Clemens
Mark Twain's first name was Samuel. His full name was Samuel Longhorne Clemens.
He worked for his future brother in law Charles langdon
Writing
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Mark twain liked visiting libraries as a youngster.