“If someone absolutely needs to be done in, better to do it yourself.”
In a matter like this for those without any real valid connections, doing it yourself would be a must as you are the only one you can trust.
However, if you have any known associations with the victim, you’re gonna be a suspect. If you have a conscience, you will give yourself away. If you leave any forensics, you’re gonna get caught.
The best thing to do is just move on and get over it.
Of course, there’s that too.
Not that *I* have anyone I'd like "disposed of" ... just saying where the best place to do it is.