First of all; I was only answering the question about if you could weaponize mrsa. Not anything about if this guy could have had it done to him. MRSA survives on surfaces for extended periods of time and is very contagious, so yes, it would be easy to do.
As to the rest of your comment: MRSA can cause sepsis, and coagulopathy is a common symptom of sepsis. So really you’re just asking the wrong question. The guy died of complications from a MRSA infection.