Bill Cosby’s wife has claimed her husband was a victim of “mob justice” and accused his victim of lying under oath in the trial that found him guilty of sexual assault last month.

In an impassioned statement posted to her husband’s Facebook page, Camille Cosby said the testimony of the key witness in the trial was “perjured, unsupported by evidence, and “riddled with innumerable, dishonest contradictions”.

She called for a criminal investigation of Montgomery County District Attorney Kevin Steele and his “cohorts,” calling them ”a homogeneous group of exploitive and corrupt people, whose primary purpose is to advance themselves professionally and economically at the expense of Mr Cosby’s life”.

Cosby was found guilty of sexually assaulting former basketball player Andrea Constand in a highly publicised trial last month. His lawyers have promised to appeal the ruling.

The Cosby Show star has been accused of sexual assault by more than 50 women over the course of his career, many of whom allege a similar pattern of Cosby plying them with drugs or alcohol before assaulting them. Cosby has denied all of the sexual misconduct allegations against him.

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Ms Cosby likened these accusers – and the media coverage of their allegations – to a “lynch mob,” saying they had eliminated the possibility of a fair trial and an unbiased jury.

“Since when are all accusers truthful?” she asked, comparing her husband of more than 50 years to other black men throughout history who had been falsely accused of sexual assault.

She also lamented the cancellation of Cosby’s public performances in the wake of the allegations, and the fact that multiple colleges had rescinded the comedian’s honorary degrees.

“Once again, an innocent person has been found guilty based on an unthinking, unquestioning, unconstitutional frenzy propagated by the media and allowed to play out in a supposed court of law,” Ms Cosby wrote. “This is mob justice, not real justice.”

Bill Cosby: Career in pictures Show all 20 1 /20 Bill Cosby: Career in pictures Bill Cosby: Career in pictures Bill Cosby Winner of his first Emmy for 'I Spy' is Bill Cosby being congratulated by his wife Camille held at Americana Hotel, 1966 Bill Cosby: Career in pictures Bill Cosby Bill Cosby in 'I Spy', 1960s Bill Cosby: Career in pictures Bill Cosby Bill Cosby in July 1973 in Perth Bill Cosby: Career in pictures Bill Cosby Bill Cosby and Richard Pryor in 'California Suite', 1978 Bill Cosby: Career in pictures Bill Cosby Bill Cosby and Elmo in Sesame Street, 1989 Bill Cosby: Career in pictures Bill Cosby Bill Cosby poses for a picture with Florence Griffith-Joyner in June 1989 Bill Cosby: Career in pictures Bill Cosby Comedian Bill Cosby back in 1992 Rex Features Bill Cosby: Career in pictures Bill Cosby A scene from a 1992 episode of 'The Cosby Show' AP Bill Cosby: Career in pictures Bill Cosby US Monica Seles breaks into laughter as she jokes with comedian Bill Cosby during a celebrity match in the stadium at the US Open for the Arthur Ashe AIDS Challenge on 27 August 1995 Bill Cosby: Career in pictures Bill Cosby Bill Cosby meets Toronto Blue Jays' All-Star Joe Carter after the Stars played the Stripes in the Celebrity All-Star game which preceded workouts for the 67th All-Star Game at Veterans Stadium on 8 July 1996 in Philadephia Bill Cosby: Career in pictures Bill Cosby Co-hosts Oprah Winfrey and Bill Cosby joke with each other during the opening of the 2000 Essence Awards 14 April 2000 at Radio City Music Hall in New York City Bill Cosby: Career in pictures Bill Cosby Bill Cosby jokes with baseball great Hank Aaron after they both received the Presidential Medal of Freedom Award from U.S. President George W. Bush during a ceremony on 9 July 2002 at the White House in Washington Bill Cosby: Career in pictures Bill Cosby Bill Cosby poses backstage after winning the 'Bob Hope Humanitarian Award' during the 55th Annual Primetime Emmy Awards at the Shrine Auditorium on 21 September 2003 in Los Angeles Bill Cosby: Career in pictures Bill Cosby 'Tonight Show' host Jay Leno and comedian Bill Cosby laugh during a surprise visit by Cosby to sign a Harley-Davidson motorcycle that Leno is using to raise money for the victims of Hurricane Katrina at NBC studios on 9 September 2005 in Burbank, California Bill Cosby: Career in pictures Bill Cosby Bill Cosby speaks during a taping of 'Meet the Press' at the NBC studios on 14 October 2007 in Washington Bill Cosby: Career in pictures Bill Cosby Bill Cosby at the 12th annual Mark Twain Prize for American Humor at the John F. Kennedy Center on 26 October 2009 in Washington Bill Cosby: Career in pictures Bill Cosby Bill Cosby speaks at the National Action Network's 20th annual Keepers of the Dream Awards gala in New York on 6 April 2011 Reuters Bill Cosby: Career in pictures Bill Cosby Bill Cosby during the 100th anniversary celebration of the Beverly Hills Hotel & Bungalows supporting the Motion Picture & Television Fund and the American Comedy Fund, 2012 Getty Images Bill Cosby: Career in pictures Bill Cosby Bill Cosby speaks onstage at the Thurgood Marshall College Fund 25th Awards Gala on 11 November 2013 in Washington Bill Cosby: Career in pictures Bill Cosby Bill Cosby performs at the Treasure Island Hotel & Casino on 26 September 2014 in Las Vegas

The comments echoed those of Cosby’s defence team in their closing remarks, in which they called the prosecution a “lynching” and decried the “mob rule” of the Me Too movement – an anti-sexual assault campaign that started years after Cosby’s 2015 arrest.

All 12 jurors in the case recently released a statement reasserting their confidence in the guilty verdict, and dispelling the notion that the Me Too movement had played any role in their decision.

“Our decision was not influenced in any way by factors other than what we heard and saw in the courtroom,” the jurors wrote. ”Not once were race or the #metoo movement ever discussed, nor did either factor into our decision.”

The jurors also said they found Ms Constand’s account “credible and compelling”. Defence attorneys had tried to poke holes in her allegations during the trial, pointing to more than a dozen inconsistencies in her statements over the years.

The prosecution countered by bringing in a forensic psychologist to explain that it was normal for a sexual assault victim’s account to evolve over time.

“In 2018, I think that we are more educated about this as a society, certainly more than we were 20 years ago,” forensic psychologist and Temple University professor Barbara Ziv testified.