weekley jones said it was impossible to be sure, but she had a theory. >> i think that she was pushed off the cliff and didn't make it, and her hands were stomped on in order to get her to continue her fall off the cliff. but the injuries on her hands were more consistent with a struggle or that scenario than a simple fall off the cliff. >> this was a harrowing possibility. it meant that while donna was hanging on to the cliff's edge, one or both of the mcginnises sent her to a certain death. >> there was no what we call pattern injury to help determine as to what she was struck with. she could have been struck with a fist for all i know, or she could have been struck with an instrument. >> these were the wounds of someone who was fending off an attack and then died, as opposed to somebody who flopped down a cliff and had some things break along the way. >> but were the mcginnises capable of cold-blooded murder? and if they were, could it be proven? to find out, investigators did a background check and were shocked by what they found. virginia mcginnis was no stranger to deaths that l