An archived article, "Near Death Explained" from Salon Magazine, provides a very clear and complete discussion of the strongest evidence for Near-Death Experiences being an expression of a spiritual existence independent of the physical body. The article provides numerous NDE reports including the case of Pam Reynolds who experienced an NDE while in a medically induced state of death. Additional reports include discussions of NDEs of the blind and scientific statements from NDE researchers such as Bruce Greyson and Sam Parnia.
Though this article appeared in 2012, the discussion is still relevant, and the article provides a very clear discussion of phenomena studied by NDE researchers. See the full article here.