Off the Wall Question-Stunting Growth

Ok, I know this is kind of a fucked up question but… In your opinions what would be the best stuff for STUNTING GROWTH in a developing animal/human male/female.

And if the growth plates sealed up… would the internal organs keep growing? Would it be serious enough to cause death?

None of this is ment to be taken as a plan or a how-to question… I was just sitting around explaining to someone that Steroids don’t have to be a bad thing and I thought of this… now I’m interested.