I agree, J.J.Leigh would have been great in this story but there would have been a problem : because of her so famous performance in "Single White Female", people could have guess that she was the real criminal . Don't you think so ?
"Don't act, be !" (Kate Winslet)
That's a good point. So had it been Fonda then it would have been less obvious. I would have preferred Leigh though.
Keep silent unless what you are going to say is more important than silence.
There was an article about Argento's TRAUMA - I think in Cinefantastique, not Fangoria - in which he talks about the planned project with Fonda signed on. It was originally to be shot in Arizona.
I don´t think it would have worked well as an american version, and I don´t mean comercially, but it would have turned into a much less interesting movie.