John Ritter by Fred Hayes/ John Ritter by Fred Hayes/

The late John Ritter's relatives on Tuesday are taking to trial a $67 million lawsuit alleging that the actor would have survived his 2003 emergency surgery if two doctors had recognized his heart abnormality and not treated it as a heart attack, thus doing the "exact opposite" of what was needed, say court papers.

Defense lawyers counter that Ritter's condition (aortic dissection) mimics a heart attack, and as such the two doctors did nothing wrong.

As part of the plaintiffs' case, Hollywood execs will testify as to how much Ritter might have earned if he had survived and continued with his hit TV show, 8 Simple Rules. Thus far, his second wife, Amy Yasbeck, and his four children have received some $14 million in settlements with nine other medical entities.