2005: Andrea Constand, a former employee of Cosby's alma mater Temple University, said the comedian had drugged and sexually assaulted her in 2004. She filed a civil suit against him, and 13 other women with similar stories were to have testified.
One of the women, lawyer Tamara Green, appeared on television show Today and said he had drugged and groped her when she was a 19-year-old model in 1970.
Another of the women, model Beth Ferrier, said she ended an affair with him in the 1980s after he drugged her and she woke up in a car with her clothes "a mess".
2006: Constand's suit was settled for an undisclosed sum. Another of the women, actress Barbara Bowman, said Cosby assaulted her several times when she was his 17-year-old protege in 1985. By the time she and Ferrier told their stories, the statute of limitations had ended on their cases.
October 2014: Comedian Hannibal Buress called Cosby a rapist during a stand-up routine at the star's hometown Philadelphia, repeating a joke he had told on and off for six months, according to The Washington Post. This time, the joke was captured on video and posted online by Philadelphia magazine.
Nov 13, 2014: Bowman wrote an article for the Post headlined: "Bill Cosby raped me. Why did it take 30 years for people to believe my story?" She said she was grateful for "the new attention to Cosby's crimes", but wondered why there had been no public outcry before a man, Buress, called the star a rapist.
Nov 16, 2014: Writing for Hollywood Elsewhere blog, publicist Joan Tarshis said Cosby drugged and raped her when she was 19 and working with him in 1969.
Nov 18, 2014: Model Janice Dickinson became the biggest name to accuse Cosby of drugging and raping her.
Feb 13, 2015: Two more women made claims of assault. One told reporters she met Cosby in 1969 in Canada and went to his hotel suite where he gave her a soft drink that caused her to black out. She said that when she woke up, she was naked next to him in bed.
July 16, 2015: United States President Barack Obama weighed in on the scandal, saying that drugging and having sex with someone without consent - a scenario that parallels allegations made against Cosby - amounts to rape.
July 28, 2015: Thirty-five women who allege that they were sexually abused by Cosby united on a magazine cover to tell their stories of abuse. One said he raped her while she was grief stricken over the recent death of her six-year-old son.
July 29, 2015: Constand said in court documents that she is a lesbian, despite Cosby's sworn assertions that their encounter was consensual and that he has a knack for reading women's cues.
Aug 6, 2015: Cosby was ordered to give a sworn deposition in a lawsuit brought by a woman accusing the comedian of plying her with alcohol and sexually abusing her at the Playboy Mansion in Los Angeles when she was 15 years old.
Aug 13, 2015: Actresses Eden Tirl and Linda Ridgeway Whitedeer and ex-flight attendant Colleen Hughes say Cosby assaulted them. "His attack was fast with surgical precision and surprise on his side," Whitedeer said, adding that Cosby forced her to perform oral sex during a 1971 job interview.
Aug 21, 2015: Two more women claimed that Cosby sexually assaulted them. One, Charlotte Fox, said that her assault took place at the Playboy Mansion in Los Angeles in the 1970s, when she was a 23-year-old aspiring actress.
Oct 1, 2015: Three more women, including former Mrs America Lisa Christie, accused Cosby of sexual assault. When Christie, then 18, refused his advances, he warned her she would never make it in the business unless she slept with him.