Washington (CNN) -- Presidential hopeful Herman Cain said he didn't remember ever knowing Sharon Bialek when she went before TV cameras Monday to accuse him of sexually groping her in 1997, but the two were seen talking last month.

A Chicago radio host told CNN Wednesday that she saw Bialek approach Cain at a tea party event on October 1, and the pair engaged in a conversation that day.

The account by Amy Jacobson of AM560 WIND in Chicago, first reported by the Chicago Sun-Times, corroborates Bialek's version of the October meeting provided at Monday's news conference.