First of all, my condolences. I don't really know what to say more, the loss of a loved one is always harsh and hard to get through.

Secondly, I do know people from my family and outside who experienced a very similar/exact same thing. Is this a proof of existence of the spiritual world? Who knows. I try to not think too much about it, it's very easy to get lost in deliberations for hours and it is kind of scary. We humans don't like the unknown.

Though I have to admit, events like this do add some mysticity to our otherwise pretty well documented world.