It has been since back in my teens the last time I saw this segment. I remember something about a woman being killed, and whoever was in the car with her left a bra that was not the woman's size or something. This has been close to 20 years ago since I have seen this but I clearly remember Robert Stack hosting this.

The only thing that rings a bell is the Debbie Wolfe case, where she was found with clothes on that were not hers, including a bra that was three sizes larger than what she wore. Here is the case: http://unsolved.com/archives/debbie-wolfe

Ok then that must it then.