The Centers for Disease Control and Prevention's Wonder database contains data on all deaths in the U.S. from 1999 to 2014. Day by day, the breakdown was fairly equivocal, ranging from a low of 5.6 million total deaths on the Sundays to a high of 5.7 million total deaths on the Saturdays of those years. So, during this time frame, Saturdays contained the most deaths, and therefore Saturday is the day of the week during which the most people died.
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