Yep I have to think that it could happen. I have heard of angels taking over a human body when person has given up on life. I can't think of what it is called...agh! But before someone commits suicide and angel replaces the human soul. I read this in a Doreen Virtue book too.
Let me think of what it is called.....
FOUND IT!
http://en.wikipedia.org/wiki/Walk-inBut this seems to be a Mytho...anyway makes for good reading.
A typical modern walk-in report is similar to near-death experience, generally involving a human who is initially injured, ill, incapacitated, or seems to "die" and then recover during surgery. Deep emotional trauma and suicidal desires are said to be other suitable settings for the "walk-in".
After recovering the "walk-in" may behave dramatically differently from previously established behaviour patterns. S/he may speak in an unfamiliar language, self-identify under a different name, be disoriented, or supernally calm. Under current conditions such experience cannot be proven to have an objective basis or "reality"; in psychological terms, this subjective experience might be caused by depersonalization.
In the popular mythos the walk-in exists to provide an accessible wisdom, via close encounters with the nature of personality or death. Typically the walk-in's statements reflect popular obsessions, often of a New Age character, and may be considered "wise" by virtue of slightly archaic language and non-committal references to the metaphysical. Typical statements might include "It is not known where the original inhabitant of the body has gone", and references to reincarnation via the statement "the original soul has left and gone on". The new individual may claim he or she is an angel; a "new" version of the former self; an older, more experienced soul; less often, a brand new one who has never incarnated before; or other origins.