He was an overweight and physically unattractive guy. What was attractive to some women about him is that he did those murders.
It's an extremely macho thing to kill someone, and there's a certain segment of women who are turned on by that.
He's not being described as sexy. I'm sure nobody's writing to him.
If he's in for life, he's safe. He can't abuse her. She is in control of the relationship.