Anons, surely this is not news to you, but Da Fuk?
No sauce that I'd consider credible. It appears the only stories are bouncing around the bullshit echo chamber: (https://www.sgtreport.com/2018/08/special-agent-who-handled-hillary-clinton-during-2016-seizure-like-collapse-dead-at-49/ , https://www.puppetstringnews.com/blog/again-hillarys-2016-election-secret-service-agent-todd-madison-dead-at-49 ).
There is an obituary but its authenticity has beed questioned: (https://www.legacy.com/obituaries/name/todd-madison-obituary?pid=187520772)
However, he's no less interesting if alive: https://www.k2intelligence.com/en/global-content/bios/m/madison-todd
This, I mean.