The oceanographer Matthew Fontaine died at the age of 67. Here is all you want to know, and more!
Biography - A Short Wiki
Oceanographer who was the first to theorize about the Northwest Passage, a sea route through the Arctic Ocean, along the northern coast of North America. He was the Superintendent of the U.S. Naval Observatory until he resigned and joined the Confederacy at the outbreak of the Civil War.
He had several children, his son was the only one present during his death.