Note that US states are not consistent on what is second degree murder. I cannot find a federal definition (I'm not a lawyer - this should be seen as me not knowing the right search terms). There are many other countries with their own definitions of murder which are all slightly different.
>To avoid the need for reliance upon common law interpretations of what felony conduct merges with murder, and what offenses do and do not qualify for felony murder, many U.S. jurisdictions explicitly list what offenses qualify in a felony murder statute. Federal law specifies additional crimes, including terrorism, kidnapping, and carjacking.