The "gripping" documentary film will tell the "extraordinary" story of how Cosby finally came to face a criminal trial for sexual assault – a decade after the accusations were made.
Today, 79-year-old Cosby is due to face trial in his home state of Pennsylvania, charged with sexual assault on a woman named Andrea Constand.
The former Hollywood star's trial comes amid accusations of similar behaviour from dozens of other women dating back to the 1960s.
BBC filmmakers will explore why it took so long for allegations about Cosby to be taken seriously, hearing testimonies from the journalists, co-stars and accusers who fought for years for the story to be heard.
Cosby: Fall Of An American Icon documentary to reveal 'extraordinary' story of accusations
Cosby: Fall Of An American Icon airs tonight on BBC Two
Throughout his career, Cosby was allegedly privately drugging and raping women with impunity, with accusations from numerous women falling on deaf ears for more than a decade.
Tonight's documentary includes interviews with Richard Pryor’s widow Jennifer Lee Pryor, as well as accusers, fellow Cosby actor Lili Bernard, and former actor and Playboy bunny Victoria Valentino.
Previously a role model to African-Americans and a philanthropist for black causes, Cosby was an American icon.
One of America's wealthiest celebrities, stand-up comedian and presenter Cosby first came to prominence in 1965 as the first black American actor to appear in a starring role in a mainstream drama.
Bill Cosby: Fall Of An American Icon airs tonight on BBC Two
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African-American comedian Hannibal Buress publicly denounced Cosby as a rapist in 2014 without reprisal, leading to dozens of women coming forward alleging similar behaviour.
However, Cosby will face a criminal trial for only one of them as the majority of their cases happened "too long ago".
Cosby vehemently denies all the allegations.
He previously told ABC: “I have been in this business 52 years and I've never seen anything like this! And reality is the situation, and I can’t speak.”
A lawyer for Cosby said: "The time has come to shine a spotlight on the trampling of Mr Cosby's civil rights."
Cosby: Fall Of An American Icon airs tonight on BBC Two at 9pm.