The Spirit Killer

There exist three entities, all curled up into ONE. They are; the Body, Spirit and Soul. When a person has... how do I put it ... Oh yes!... has kicked the bucket, it is said that the spirit leaves the body; the soul on the other hand, either goes to heaven or hell; a good soul goes to heaven while a bad one goes to hell. Actually we are much concerned about the spirit.
You've probably read books or maybe even watched movies about spirits; some pass the message that spirits possess powers, other portray spirits as entities that need help crossing over to the other side (wherever that is), a minute quantity believe that most earthbound spirits are evil; they have already crossed over but were sent back to cause havoc on the living souls on earth. Now! You may be wondering how all this spirit stuff affects or concerns me. Who am I? I believe an introduction is required at this juncture.