Years passed and Myrtle took over the identity of the girl that had died in the very same lavatory, thirty-three years before her. That girl had been murdered by the beast that lived in the Chamber of Secrets; Myrtle took the girl's story as her own.
The name 'Moaning Myrtle' stuck. It was how the students of Hogwarts referred to her. She tried her very best to not think of him, but couldn't help it most days. She found herself flooding the lavatory, wishing she could shed tears over him.
Sirius Black was a murderer. He had betrayed his best friends and killed another of them. He was wasting away in Azkaban. The thought of him tormented her as it always had.
And then, he escaped.
Before she knew it, he was standing before her in their lavatory.
He looked ragged and thin; his once handsome features had become hidden in the gauntness of his face. There was an undeniable madness in his years.
She was trembling.
It had been years and the first thing he said was, "You haven't changed."
"You killed all those muggles!" she screamed.
"Myrtle, I didn't!" he scrambled, "I swear. Believe me!"
And she did.