On April 3, 1968, Martin Luther King Jr. delivered a famous speech (which one? | hear it) in Memphis, Tenn. During the speech, in reference to a bomb threat, King said, "Like anybody, I would like to live a long life. Longevity has its place. But I'm not concerned about that now. I just want to do God's will." The following day, he was assassinated at 6:01 p.m. while he was standing outside of the Lorraine Motel's room 306. Who shot him?