Topeka Police Lt. Jack Mackey, left, and Jennifer Walker light candles in honor of two officers killed in the line of duty in Topeka, Kan., Monday, Dec. 17, 2012. A man with a history of theft and weapons convictions gunned down two police officers investigating possible drug activity in a Kansas grocery parking lot, and was later killed after an armed standoff, authorities said Monday. (AP Photo/Orlin Wagner)

Associated Press
Topeka Police Lt. Jack Mackey, left, and Jennifer Walker light candles in honor of two officers killed in the line of duty in Topeka, Kan., Monday, Dec. 17, 2012. A man with a history of theft and weapons convictions gunned down two police officers investigating possible drug activity in a Kansas grocery parking lot, and was later killed after an armed standoff, authorities said Monday. (AP Photo/Orlin Wagner)
Topeka Police Lt. Jack Mackey, left, and Jennifer Walker light candles in honor of two officers killed in the line of duty in Topeka, Kan., Monday, Dec. 17, 2012. A man with a history of theft and weapons convictions gunned down two police officers investigating possible drug activity in a Kansas grocery parking lot, and was later killed after an armed standoff, authorities said Monday. (AP Photo/Orlin Wagner)
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