A Bill Cosby guest booking on "Late Show With David Letterman" scheduled for Wednesday has been canceled -- the second time in a month that a talk-show booking of the comedian has been dropped. (The first was on Queen Latifah's talk show.)

Cosby, 77, is in the midst of a firestorm generated after comedian Hannibal Buress said at a gig last month that the entertainer had raped several women, telling audience members to "Google it" as proof. A video of Buress' performance went viral, and on Monday a meme generator on Cosby's website was removed after it was hijacked by users who posted messages on pictures of him, accusing him of rape.

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Also, an op-ed by Barbara Bowman -- one of Cosby's accusers from over a decade ago -- appeared in Thursday's Washington Post, headlined "Bill Cosby raped me. Why did it take 30 years for people to believe my story?"

Bowman, an artist and married mother with two children who lives in Arizona, wrote: "While I am grateful for the new attention to Cosby's crimes, I must ask my own questions: Why wasn't I believed? Why didn't I get the same reaction of shock and revulsion when I originally reported it? Why was I, a victim of sexual assault, further wronged by victim blaming when I came forward? The women victimized by Bill Cosby have been talking about his crimes for more than a decade. Why didn't our stories go viral?"

A spokeswoman for "Late Show" confirmed the cancellation but didn't give a reason. A call to Cosby's spokesman was not returned.

The allegations against Cosby surfaced in news accounts in 2006, most prominently after a woman settled a lawsuit after claiming she had been sexually assaulted in Cosby's Philadelphia mansion in 2004. Nearly a dozen women over a period of decades have filed complaints that he had sexually harassed them, or in some instances, administered so-called date rape drugs, then sexually assaulted them.

No charges were ever filed, and Cosby denied allegations at the time. More recently, he has declined to comment on them.