Ex-wife in online porn video

It was recently brought to my attention by an anonymous source that there is a video of my ex-wife posted on a porn site that shows her tied to a headboard and being given oral sex. It is three minutes long and graphic. I recognize the man's face but do not know his name. She gives no indication that she knows she is being recorded. I would assume the video was taken with a cell phone or small camera sitting stationary. She is an attractive mature middle aged lady who is active in local civic affairs and well known locally. She is not a prude, but if she knew this was out there she would be furious and very upset. Not only is this video on the link that was sent to me, but the same video is on numerous other x sites. It shows that it was posted two months ago. If someone came across this video and sent it to me then whoever it is has probably sent it to others or at least talked about it. Do I inform her?

Yes, it seems the decent thing to do.