Kyle Busch's death certificate offers new insight

Fox News senior medical analyst Dr. Marc Siegel discusses the events that led to NASCAR driver Kyle Busch's death and a new gene-editing therapy that could change the future of heart disease treatment.

Dr. Marc Siegel, Fox News senior medical analyst, discusses the tragic "chain of events" that led to NASCAR driver Kyle Busch's death, as revealed by his death certificate. Siegel explains how untreated pneumonia can progress to sepsis, causing blood clots and hemorrhagic shock in a matter of hours, shutting down vital organs.