Who is sam in ghost whisperer?

Answer 1

Sam is a man who died, he immediatly crossed over into the light, and Jim (Mel's husband) who had died either the episode before, or the episode before that put himself into Sam's body so he could be with Melinda again but it backfired because when he entered Sam's body he forgot who Jim was and had no memory of him except flash-backs of his death and Jim's medical skills.

Answer 2

he was melinas boy friend but Jim took over his body so sam is the new Jim

Answer 3

David Conrad