It so happens that I watched my first complete episode of Ghost Hunters a couple of days ago. Funniest thing ever! They're walking through the place at night, and whattya know -- they "see" and "hear" things!
All the
time!
At the end, they play audio recordings of static, and they always here something in it. Hilarious.
But, anyway, no. Once yer dead, yer dead. IMO.