Event:
U.S. Attorney General Eric Holder authorizes federal prosecutors to pursue the death penalty for Boston Marathon bombing suspect, Dzhokhar Tsarnaev
More Notable Events on January 31:
1992 Sportscaster Howard Cosell retires
1991 Nugget's Michael Adams becomes shortest NBA player to get a triple-double
1982 10 Arabian oryx, extinct except in zoos, released in Oman
1982 U.S. Male Figure Skating championship won by Scott Hamilton
1851 Gail Borden announces invention of evaporated milk
