They sound like Bernardo and Homolka, the Canadian serial killers of young girls.
If they are like that it is good they’ve been caught now. I think the woman is only being charge as an accessory after the fact, fwiw. Which is not much, because when your friend calls and tells you he’s killed somebody you’re supposed to say OK, yeah, sure, sure, I’ll meet you OK, give me 5. And then you DIAL 911.