Who was William Clark killed in a duel with?

Answer 1

William Clark was not killed. Clark died at age 69 on September 1, 1838, while at the home of his son, Meriwether Lewis Clark. His cause of death is unknown and is only described as a "brief illness."

It was Meriwether Lewis who is debated to have been either killed or committed suicide. After the expedition, Lewis was not suited for the bureaucratic life and found himself deep amongst petty and jealous administrators. Three weeks later, he was found in his rooms with two gunshot wounds at a roadside inn at Grinder's Stand, Hohenwald, Tennessee, just south of Nashville. He died the next morning on October 11, 1809. At the time, the shooting was called a suicide, but most people now believe he was murdered (randomly, not as a premeditated target). No one knows who may have killed him.