What does it mean in a dream when you are handed a magic marker by a person in a body bag?

1) First, allow yourself to contemplate on this. If an answer comes to you, consider it.

2) When your dream contains people, this can often indicate that the person or persons are representations of yourself or aspects of yourself. A magic marker is a "permanent" way of maintaining your identity, remembering who you are, uniquely, and that you - potentially - don't want that to be forgotten after your death.

3) No dream interpretation is definitive. Different meanings can come to you at different times.