At some point, Eugene Cattivo began to work as an agent for S.H.I.E.L.D. and eventually became a lieutenant working for them at San Conception.
Cattivo was created by legendary writer Frank Miller and artist Bill Sienkiewicz, first appearing in Elektra: Assassin #3.
Major Story Arcs
As Elektra breaks into the San Conception base, Cattivo briefly fights with her before she snaps his neck, killing him.