Three that I can initially find within the past year and a half. This is 10 minutes of searching. I'm sure there's more!
Special Agent David Raynor - https://neonnettle.com/features/1398-fbi-agent-who-exposed-hillary-clinton-cover-up-found-dead
Salvatore “Sal” Cincinelli - https://thewashingtonpundit.com/2019/07/24/top-fbi-agent-investigated-clinton-foundation-commits-public-suicide-at-dance-club/
Now another one? Infowars didn't type an article. - https://www.infowars.com/fbi-agent-investigating-satanic-ritual-abuse-reportedly-carried-out-by-clintons-killed-watch-live/
On my initial glance at the title, I read it as "Multiple FBI Agents Investigating: Clintons Found Dead" and got excited, then I realized it was more along the lines of "Multiple FBI Agents, Investigating Clintons, (were) Found Dead" and got sad.