Victor Conte, a convicted steroids dealer turned outspoken anti-doping advocate who played a prominent role in boxing over the last 15 years, has died at the age of 75.

The cause of death was not announced by Conte's family on Monday.

Conte revealed in June that he was diagnosed with pancreatic cancer and was undergoing chemotherapy treatment.

SNAC released a statement on Monday addressing Conte's death: “We are heartbroken by the passing of our fearless leader, SNAC mastermind, CEO, anti-doping advocate, creator of ZMA, former Tower of Power and Herbie Hancock bassist, Victor Conte. We will honor his wishes. SNAC and his legacy will carry forward, strong and forever. We love you, Conte!”

Conte was a controversial figure in sports, and boxing, as the founder of the now-defunct Bay Area Laboratory Co-operative (BALCO), and, until the time of his death, the founder and leader of Scientific Nutrition for Advanced Conditioning (SNAC Nutrition).

In 2005, Conte served four months in prison after pleading guilty to conspiracy to distribute steroids and money laundering. BALCO was raided by federal investigators in 2003 and tarnished the reputations and legacies of athletes who were linked to the company, such as baseball icon Barry Bonds, track and field star Marion Jones, and three-division boxing champion “Sugar” Shane Mosley.

Through SNAC, Conte reemerged in San Carlos, California, in recent years and claimed that he was reformed and reinvented by advocating for legal supplements, high-tech training, and year-round drug testing.

Conte worked with several high-profile boxers through SNAC, including Terence Crawford, Devin Haney, Andre Ward, Claressa Shields, Caleb Plant, Mikey Garcia, Mario Barrios, Demetrius Andrade, Shawn Porter, Daniel Jacobs, Andre Berto and Luis Ortiz, among many others.

Mosley was linked to Conte during the BALCO days. Mosley would later end up filing a $12 million lawsuit in 2008 alleging Conte didn’t inform him that the designer steroids supplied were performance-enhancing drugs ahead of Mosley's 2003 win in a rematch against Oscar De La Hoya. The case was later dismissed.

Conte said last year that he's worked with 28 world champions in boxing.

Conte was also the focal point of Netflix's 2023 documentary "Untold: Hall of Shame." Conte claimed he made $80 million in sales with his SNAC supplements throughout the years.

“Should I send the feds a thank you card?" Conte said with a grin in the documentary. “They might have made me millions of dollars.”

Jeff Novitzky, the IRS agent who led the BALCO investigation at the time, and who now oversees the UFC’s drug-testing program, called Conte a “used-car, snake-oil salesman guy, bull (expletive) artist."

On the SNAC website, while listing all of the fighters he’s worked with, it says that "Conte’s results-driven and unequivocally brilliant approach to sports science has benefited thousands of athletes."

In recent months, Conte remained a colorful and outspoken figure on social media, going head-to-head with the likes of Ryan Garcia and many of his other detractors.

“Once I decided to do the right thing, I can tell you the changes I recommended were applied in the World Anti-Doping Agency (WADA) Code. I changed the world," Conte said in an interview with Lance Pugmire of BoxingScene in June while discussing his cancer treatment.

"A lot of people I know have developed cancer at an earlier age than where I’m at. If anything, [the SNAC product] ZMA, with Zinc, boosted my immune system when I needed it most.

“Cancer attacks your immune system. This is why I had to go to the E.R., and remain on a continuous IV, antibiotics and all these other things.

"The great news is it didn’t spread beyond my pancreas. I’ve got a stint implanted in my bile duct. My appetite is back after losing 40 pounds … It's been a very difficult time. I’m just glad to be able to continue to do what I do. None of this is about money. It’s never been about making money for me. I’ve got a ton of money saved. I get to do what I love to do with the people I love to work with.

“Even during these tough times, I feel blessed to be in this position and do what I love the most. To be in the trenches with world-class athletes, helping them achieve historic performances.”