Necklace of Truth: Karyn Killed Jon's Grandfather?

"Who did you kill?" Jon asked. Karyn, unable to tell a lie, said "It was your grandfather." "Wait, what? My grandfather died of a heart attack." "I know. I was there," Karyn said. "You were where? Karyn, I think you better tell me what you know about my grandfather's death. Earlier, you seemed genuinely shocked when I told you that he died. But you already knew all along? Tell me what happened." Karyn took a deep breath and told him ...