How is basal metabolism related to calories

The basal metabolic rate is the rate of energy expenditure per unit of time of a person. This means that the basal metabolic rate refers to the energy that you need to survive for a minute. Another way of understanding this is the number of calories that are required in order to keep your body functioning while you are at rest. This number, however, will change based on changes on physical activity.

when comparing the cases, what similarities are there in the cases that suggest one person committed these murders?