Red Skull
Escaping the French S.H.I.E.L.D. guards, Cap jumped into a tele-plane (a jet which teleports), to where the Avengers were fighting the Red Skull, in Alaska. When he arrived, Red Skull, who was wielding the Cosmic Cube, subdued Rogers' jet. However, Cap ordered Hawkeye the coordinates for the Red Skull's position in which he had the jet teleport to the Red Skull and fatally impale his son on the tele-plane's nose. After the Red Skull was in custody, Rogers emotionally bear witness to Gail Richards to be briefly reunited with her dying son.