Final answer:
Craig would likely be charged with homicide, characterized as murder, but specific charges and defenses would depend on several factors including his mental state and the jurisdiction's laws.
Step-by-step explanation:
The scenario described where Craig discovers his wife with his best friend and subsequently shoots the friend to death would likely result in Craig being charged with a homicide offense; specifically, this act could be classified as murder. In a court of law, Craig's actions might be assessed based on the circumstances leading up to the shooting, including any mental state defenses such as provocation or temporary insanity which may influence the degree of murder or introduce the possibility of voluntary manslaughter. The determination of the crime Craig would be guilty of depends on the details of the situation and his state of mind as well as the legal definitions and distinctions in the jurisdiction where the crime took place.