Who killed Patrick Henry?

Unless the killer's name was Stomach Cancer then he died of natural causes because that was the listed cause of death when he passed away at the age of 63 on 6 June 1799 at Brookneal, Virginia. He is best known for his speech on 23 March 1775 to the Virginia Convention known as the "Give me liberty or give me death speech". No copy of that speech exists, but most of the key points of what we have of it now comes from "Life and Character of Patrick Henry" by William Wirt which was first published in 1816.