They also kill other people's pets, as I've recently discovered. :c
OP, I've nothing against cats and the method that alphabetafeta96 suggested is actually one that someone I know used (successfully). However, do keep in mind that cats, by nature, like to roam around, and
by nature, they like to hunt. If you do make it an outdoor cat,
please train him/her (to defecate in appropriate locations) and also
please put a bell on it's collar or something else to warn pets and wildlife :c.
Also, if possible,
keep them well-fed to reduce any tendencies to hunt b/c of hunger.
All the best to you and your kitty