Did Stephan Bonnar Die From Vaccine SADS?!

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Did UFC Hall of Famer Stephan Bonnar die from vaccine-induced sudden adult death syndrome (SADS)?!

Take a look at the viral claims, and find out what the facts really are!

Updated @ 2023-04-30 : Updated with Stephan Bonnar’s autopsy results and cause of death
Originally posted @ 2022-12-30


Claim : Stephan Bonnar Died From Vaccine SADS

Right after news broke that Stephan Bonnar died suddenly at work, anti-vaccination activists immediately claimed that the 45 year-old UFC Hall of Famer was a victim of COVID-19 vaccine sudden adult death syndrome (SADS)!

Here are some examples on social media:

Another Young healthy active person drops dead UFC Hall of Famer Stephan Bonnar died unexpectedly while at work ;((. SADS FDHS, “we don’t know why he died but we do know it was not the mRNA vaccines“ will follow shortly

ANOTHER VACCINE DEATH UFC Hall of Famer Stephan Bonnar Dies at 45

Huh, lots of Athletes, people in great shape are dropping dead of ‘presumed heart problems’. It’s one of the top side effects of Covid vaccines. Just sayin! -UFC Hall of Famer Stephan Bonnar dead at 45

Recommended : Died Suddenly : Anti-Vaccination Movie Lies Exposed!

Did Stephan Bonnar Die From Vaccine SADS?!


Truth : Stephan Bonnar Did Not Die From Vaccine SADS!

It’s now a tradition for anti-vaccination activists to immediately blame all athlete deaths or illnesses on the COVID-19 vaccine.

This is yet another example of FAKE NEWS created and propagated by anti-vaccination activists, and here are the reasons why…

Fact #1 : Stephan Bonnar Died From Drug Overdose!

Stephan Bonnar (born Stephan Patrick Bonnar on April 4, 1977) was an American mixed martial artist who was also known as The American Psycho. He was inducted into the UFC Hall of Fame on July 6, 2013.

On Thursday, December 22, 2022, UFC announced that Stephan Bonnar died from “presumed heart complications while at work“. Reports claim that he died from heart failure, but that was never confirmed.

The Clark County coroner’s office conducted an autopsy on Stephan Bonnar after his death. Typically, the coroner’s office determines a cause and manner of death within 90 days, but a spokesperson said that his case required more time because it required additional testing.

On Monday, April 24, 2023, the Clark County coroner’s office finally revealed their official cause of death for Stephan Bonnar – Fentanyl, Parafluorofentanyl and Mitragynine intoxication“. His death was ruled as “accidental“.

Fentanyl is the synthetic opioid that is responsible for many sudden deaths in the United States, while parafluorofentanyl is an analogue of fentanyl.

Fentanyl and its analogues are about 50X stronger than heroin, and 100X stronger than morphine, and have been linked to tens of thousands of deaths every single year, in the United States alone.

Mitragynine is the active compound derived from the kratom plant, and is commonly use in the United States as a painkiller, and to help with opioid withdrawal symptoms.

Recommended : Aaron Carter Autopsy Reveals True Cause of Death!

Opioid and fentanyl deaths in United States 2021

Fact #2 : Stephan Bonnar Used Steroids + Opioids

Stephan Bonnar had a history of steroids use. Back in November 2012, he tested positive for Drostanolone – an anabolic steroid. That was his second positive test, after testing positive for another anabolic steroid – Boldenone, in 2006.

He also had a history of opioid use. In a September 2021 interview with MMA Fighting, he shared that he was on a 30 mg/day regimen of oxycodone to treat his long-term injuries.

After his death, UFC middleweight Sean Strickland came out to criticise those who tried to whitewash his death, stating that Stephan Bonnar was addicted to opioids.

… the Stephan Bonnar I knew was fucking nuts. He was addicted to opioids, he got arrested, got kicked out of the hospital because they wouldn’t give him opioids, his gym went under during COVID.

The coroner’s report confirmed, once and for all, that the Stephan Bonnar was just another victim of the opioid crisis in the United States. It should be noted that he isn’t the first MMA fighter to die from fentanyl.

In May 2022, Bellator fighter Jordan Young was confirmed to have died from an accidental overdose of fentanyl and alprazolam (better known as Xanax).

Recommended : Sam Westmoreland : Cause of Death NOT Vaccine!

Did Stephan Bonnar Die From Vaccine SADS?!

Fact #3 : Stephan Bonnar Was Anti-Vaccine

It is hilarious to see anti-vaccination activists throw one of their own under the bus. Like Kris Jordan, Aaron Carter and Kirstie Alley, Stephan Bonnar was anti-vaccination.

In September 2021, Bonnar posted a series of (now deleted) selfie videos in which he claimed he was being denied hospital treatment because he was not vaccinated against COVID-19.

Fact #4 : Stephan Bonnar Was Not Vaccinated

As far as I can tell – Stephan Bonnar was never vaccinated against COVID-19. He publicly spoke out against the COVID-19 vaccines, and said that he was not vaccinated in September 2021.

The COVID-19 vaccine is not mandatory in the United States, despite what anti-vaccination activists may claim.

So regardless of the actual / official cause of death, it had nothing to do with the COVID-19 vaccines.

Fact #5 : Claims Of Athletes Injured By COVID-19 Vaccine Proven False

This is yet another example of anti-vaccination activists abusing athlete deaths / injuries to create and propagate FAKE NEWS about the safety and efficacy of COVID-19 vaccines.

So far, claims of athlete deaths / injuries due to the COVID-19 vaccine have been proven false. Here are just some of the latest examples:

Will these anti-vaccination activists apologise for lying to you? Nope! They will just move on to the next athlete tragedy…

Please help us FIGHT FAKE NEWS by sharing this fact check article out, and please SUPPORT our work!

Don’t forget to protect yourself, and your family, by vaccinating against COVID-19!


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Dr. Adrian Wong has been writing about tech and science since 1997, even publishing a book with Prentice Hall called Breaking Through The BIOS Barrier (ISBN 978-0131455368) while in medical school.

He continues to devote countless hours every day writing about tech, medicine and science, in his pursuit of facts in a post-truth world.


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