I just received the FedEx delivery of Kathy Krajco's death certificate. I will share the relevant details.
The date she was pronounced dead was May 9, 2008. The certificate indicates her body "was found 24 or more hours after death" in her own home. The coroner certifies that, in their opinion, her death was due to natural causes. The box for indicating the "actual or estimated date of death" is marked "Unknown". Box 19a is for "Informant's Name". Kathy's sister name is in that box. So, I guess we can assume it was her sister who found Kathy's body. The sister's physical address does prove she lived across the street from Kathy.
It can be concluded that the experts believe Kathy died of natural causes and not of foul play. It can also be concluded she was not found for some considerable time after her death. Likely it was a couple of weeks when we consider her last blog post was April 15, 2008. She approved comments for her last post for what looks like could have been four days following her last post. Given she was blogging regularly every day or every few days for months, I think we can assume she probably passed away almost a week after her last posting.
I hope this information is helpful for all who are trying to make sense of her tragically sudden passing.