I just found this and am glad that I did. When my grandmother passed, I was surprised that I didn't feel sad. She was a fearless woman but both loved and feared God as the good book says decent people should. She absolutely believed in an afterlife and I just knew she'd found it, because I feel the same.
I'll check that documentary out, thanks for sharing it. If you read the book Life after Life by Dr. Raymond Moody, it may provide some insight that this existence isn't all that there is, he has a website as well.
It makes no sense and isn't logical that we're born, then die, and that's it. This Universe is too big for that and was created to be explored and lived in. You did well to honor your friend. :)