Question: Donny Student had survived a semester of criminal law with Professor Carreto. On the day of his final exam, he arrived exhausted from spending the three previous nights studying for her race horse test. Upon reading the exam, Donny became furious. His professor had humiliated him again in one of the exam hypotheticals. Other students began to snicker during the exam. Unable to focus, Donny stormed out of the room and headed for the professor's office. He was sure that his professor was out to destroy him. When Donny arrived at his professor's office, Carreto was laughing and gesturing wildly with a pencil. Donny takes a small gun and shoots and killed the professor. What crime(s), if any, has Donny committed?