See culprit in Webster's New World College Dictionary
noun
a person guilty of a crime or offense; offender
Archaic a person accused of a crime, esp. by arraignment before a law court
See culprit in American Heritage Dictionary 4
cul·prit
noun
One charged with an offense or crime.
One guilty of a fault or crime.
Origin: Probably from cul. prit, abbreviation for Anglo-Norman *culpable: prit d'averrer nostre bille, guilty: (I am) ready to aver our indictment : culpable, guilty (from Latin culpābilis; see culpable ) + *prit, ready (variant of prest, from Latin praestō; see presto ).