I believe the entertainment industry has access to this technology. Do you know of any dead celebrities that are now mysteriously alive? I say where there is smoke, there is fire.
My favorite dead celebrity is now dead again. This time for good. His name was Roger Ebert. As I recall, he died mid 90's of a massive heart attack the first time. It came as no surprise to me and my wife at the time. Since Roger was as big as a whale. Very very over weight. How he came back alive is a mystery to me. But that seems to be a very common occurrence in the entertainment industry.
Other people can recall other celebrities as well. If you're really serious, find out all about these dead and reborn celebrities. Possibly do some leg work and contact their families.
I know grieving is very hard for some. But while you are healing, it certainly wont hurt to investigate this possible outcome.