What does Noah know about his Grandpa Bobby's death?

Noah has heard different stories about how his grandfather died. He heard that his grandfather's appendix burst or that his grandfather got hurt bad in a bar fight. All Noah knows for sure is that Grandpa Bobby took his fishing boat down to South America for some sort of a job, and he never came back. One day someone from the U.S. State Department came to Noah's house and told his parents that Grandpa Bobby was dead and buried near some small village in Colombia. They said that his body could not be brought home.