Daniel Whitehall

Daniel Whitehall is a Hydra leader revealed to be Werner Reinhardt, a Nazi scientist who has kept himself alive for decades using a captive Inhuman's regenerative blood. He is killed by Coulson in a raid on his Hydra base, not long before the Avengers descend on the same location.

First turns up in Agents of S.H.I.E.L.D. (Season 2).