I can agree with the 'time bomb' statement. The 90 % blockage of his Right Coronary Artery ( RCA) was at the Proximal ( beginning ) end of the artery. Also, it was subtly pointed out by Nelson yesterday that this area of the artery is VERY VERY close to the electrical conduction point that starts every beat and regulates the rhythm of the heart beat, known as the SA node. A 90% occlusion of this artery is dangerous, and any increased stressors on the heart (Known heart disease, hypertension, uncontrolled narcotic and stimulant abuse, resisting arrest and fighting against those restraints ) would definitely be causative stressors inducing the heart to struggle and stop.
This blockage, IMO is/was very similar in nature to the stories we may all acquaint with the patient who suddenly collapses while shoveling a heavy wet snow.
Also IMO, the juror who is a Cardiac Nurse knows all of this as well