A student paused Thursday evening at the memorial for the victims of the 2007 massacre at Virginia Tech. There was another vigil last night, following Thursday's killing of a campus police officer. Steve Helber/AP hide caption

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Virginia Tech officer Deriek Crouse, who died Thursday. Virginia Tech hide caption

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Claudio Sanchez reporting for 'Morning Edition'
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The Virginia Tech campus is reeling after the confirmation of two deaths: a Virginia Tech police officer shot during a routine traffic stop and a second victim found at the university's Cage parking lot. Authorities are looking for the gunman. Matt Gentry/The Roanoke Times via AP hide caption

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April 18, 2007: A bow -- in Virginia Tech's orange -- makes for a solemn marker on campus. Win McNamee/Getty Images hide caption

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LANGKAWI, MALAYSIA: A snake "jumps" off of a tree branch in Langkawi, Malaysia.    Selah Reeve Hobbie Jr. /National Geographic Channels hide caption

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Sakes Alive! Snakes That Fly!
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