Jasper Sitwell

Jasper Sitwell was a level 7 S.H.I.E.L.D. operative and member of HYDRA - double agent. He became a good friend with Phil Coulson. His true allegiance was uncovered by Captain America and Black Widow wo kidnapped him and forced him to reveal the truth. He was killed by the Winter Soldier. He was an expert combatant and a master spy. He was a straightforward person and remained calm and collected in even the most dangerous situations.