The 39 year old, who appeared in U.K. TV dramas Footballers' Wives and The Bill, received the news from doctors last month (Jan12), and has put off a planned trip to Los Angeles to fight the disease.
In a series of posts on his Twitter.com page, he tells fans, "After getting (sic) scariest news... I have to now postpone my LA adventure for at least six months. I was born a fighter and will fight this.
"Time to battle the big C. Prognosis is good gang and should kick this into touch in about six months, well this should be a different journey."
Richards is preparing to undergo radiotherapy treatment.