The recent murders at Oikos Univ. in Oakland, Calif., are another in a long line of April tragedies in the U.S. Consider the Virginia Tech killing spree in 2007, the 1997 Columbine H.S. massacre and the Oklahoma City bombing in 1995. Decades earlier, the Rev. Dr. Martin Luther King Jr. was assassinated in April 1968. Perhaps such a traumatic history in April is mere coincidence, but journalists covering crises and catastrophes should be aware of how often the past becomes prologue.