"Show me just what Mohammed brought that was new, and there you will find things only evil and inhuman, such as his command to spread by the sword the faith he preached." - Manuel II Palelologus
They would have one hell of a time trying to make felony murder out of the death of this guy, and absence special evidence (e.g., that he started having trouble during the incident that continued to this heart attack) I doubt they’d even try.