From reddit: I defaced your son's grave 10 years ago.
"Hello, Mrs. T,
I'm too ashamed of myself even 10 years later to reveal who I am to you. I knew your son that passed away. Sort of. We went to school together. He was in my first hour class, American Sign Language. I'd spoken to him a bit before that class, because despite my appearance, he was always so lovely to me. You raised a really good boy. I..."