anyone might know of ways to kill someone but i do know of ways
to dispose of bodies... 
1 - get a bath tub
2 - fill bath tub with acid
3 - soak/dissolve body in acid
pros
1 - no decomposition smell
2 - drain bath tub in 1 week to remove all evidence
cons
1 - cannot use bath tub while the body is dissloving in it
2 - acid might stain your bath tub