i hadn't heard that - what there a pen found that the heart was made with? any finger prints on that pen? or are we assuming if Karr did it, he wore gloves throughout the entire incident.
It was on a thread yesterday that listed facts about her body when she was found. I've never heard anything about a pen, so if the killer did it, he might have taken it with him.
Also, it's possible she drew it herself the evening before. My kids draw on their hands all the time. I can't remember if it said it was her left, or right palm. That would tell a lot. If she was right handed, and did it herself it should be on her left palm. If she's right handed, and it was on the right palm, that would most likely rule her out.