Board Thread:General Discussion/@comment-25938300-20160530130915/@comment-25938300-20160607021107

Dr.Who1997 wrote: Who says S.H.I.E.L.D. knew that Bucky was the killer? Zola revealed it to Cap and Black Widow in The Winter Soldier, so it's likely that only the involved HYDRA members knew about it. Bucky made it look like an accident, after all, so maybe they never looked for a killer.

I agree with you, even though S.H.I.E.L.D has had Hydra within since the beginning, Hydra still operates as its own independent organization. It has secrets that S.H.I.E.L.D has not been made aware of. It never looked like a double homicide, so Tony probably didn't look, maybe he didn't want to as well.