CONTROL agent who fractures a leg (that of Agent Carter) [Mentioned, Episode #110: "Greer Window"].
The following year, Willoughby dies from a fall from a plane - that hadn't left the ground yet. At first thought to be merely a strange accident, it turns out that Willoughby was actually murdered by former CONTROL trainee Adrian Listenger who had been carrying out a vendetta against former members of the CONTROL Training School baseball team, of which Willoughby was one [Mentioned, Episode #130: "The Mess of Adrian Listenger"].