Slam their head into a table until it pops off,
Choking works too but be careful man. Some of these people are freaks and get off to being choked.
The implant the CL gets can kill but it will take a while.
swirlies are funny too.
Or just throw them down the req elevator. Strap em to a chair and than call the DS up on top of em.
tons of horrific things you can to murder someone as long as your creative.