Bill, knowing his girlfriend Monica is six-months pregnant,…

Bill, knоwing his girlfriend Mоnicа is six-mоnths pregnаnt, comes home drunk one night.  He gets into аn argument with Monica and strikes Monica in the abdomen several times with his fist, all the while saying “Take that you little bastard.  I don’t want any kids.”  Two days later, Monica delivers a stillborn baby.  An autopsy reveals the child died of blunt trauma wounds inflicted as a result of the beating.  What is the most serious offense, if any, Bill has committed?