The Ghost of Hogwarts *the marauders era*

My name was Samantha Elizabeth. I was a blood traitor. I was invisible. I was a Ravenclaw. I was murdered. No one knows who did it. Except me. But, when I was alive I knew things. Sirius Black was a player. James Potter loved Lily. She hated him. Remus Lupin was a werewolf. Peter Pettigrew had a dark secret. All the marauders other than Remus were unregistered Animangi. No one knows I exist.