Would this person be guilty of anything?

Lets say person A, we'll call him Ron, is deathly aracnaphobic (spelling?), and person B (George) knows it. However, George keeps joking around with Ron, showing him pictures of spiders. Ron has warned him not to. But, George decides to get a big dead spider, and show it to Ron. George does, but it causes Ron to go into cardiac arrest and dies. What would George be guilty of?