COLORADO SPRINGS — Scott Blackmun resigned as chief executive of the US Olympic Committee on Wednesday, citing difficulties with prostate cancer and the federation’s need to urgently move forward to address the sex abuse scandal that has rocked gymnastics.
The 60-year-old CEO was diagnosed with prostate cancer earlier this winter and did not attend the PyeongChang Games in South Korea.
Blackmun leaves amid calls for his departure, including from two US senators who said neither he nor the USOC at large reacted properly to sex abuse cases involving Larry Nassar, the doctor who abused members of the US gymnastics team.
The USOC is conducting an independent review of when Blackmun and others learned the details about abuse cases at USA Gymnastics and whether they responded appropriately.
Susanne Lyons, a member of the board, will serve as acting CEO.
At a news conference to kick off the Olympics, USOC chairman Larry Probst said Blackmun had served the USOC with distinction and the board found no reason to relieve him.
‘‘Given Scott’s current health situation, we have mutually agreed it is in the best interest of both Scott and the USOC that we identify new leadership so that we can immediately address the urgent initiatives ahead of us,’’ Probst said Wednesday.
The USOC said it was starting several initiatives, including providing new funding and resources for Nassar victims. It also will review its relationships with national governing bodies of Olympic sports and double funding to the US Center for SafeSport.
John Manly, an attorney representing Nassar victims in a lawsuit that seeks monetary damages and court oversight of USA Gymnastics, said it was victims speaking out about the USOC that forced Blackmun to resign.
‘‘USOC has focused nearly all its efforts on money and medals while the safety of our athletes has taken a backseat,’’ Manly said.
Blackmun’s last several years at the helm of the USOC have been focused on establishing SafeSport, which stemmed out of task forces to determine how to compel governing bodies of all Olympic sports to use the same rules for reporting and handling abuse cases.
It was a herculean task that involved raising millions of dollars to start an independent organization that polices abuse cases in a similar manner as the independent US Anti-Doping Agency runs doping control in the United States.
But all the cases in question — including dozens involving USA Swimming and USA Gymnastics — occurred before the new protocols came into play. The shocking testimony from dozens of gymnasts who were abused by Nassar led to calls for a complete turnover of the USA Gymnastics board, and then for Blackmun’s removal.
An attorney for Olympic swimmer Ariana Kukors, Robert Allard, said Blackmun didn’t protect athletes from predatory coaches among the governing bodies of several sports.
The 28-year-old world champion has accused her former coach Sean Hutchison of sexually abusing her starting when she was 16.
Hutchison has denied the accusations and has not been charged with a crime, saying they had a consensual relationship when she was of legal age.