The dangerous heat wave that's scorching most of the United States has been blamed for at least four deaths as more than 103 million Americans are warned to stay inside and keep cool. Health officials are investigating two deaths that may be heat-related in Kansas City, Missouri. The victims have not been identified, but authorities said one of the victims was a 83-year-old man and the other a 46-year-old woman. On Saturday, Cheryl Snyder, 64, of Pennsylvania, went into cardiac arrest while working in her garden. The woman died a short time later a local hospital. In Wilmington, New York, Nick Marshak (pictured), 30, died of a heat stroke he suffered while running a race. The Fourth of July holiday isn't providing any relief from the intense heat wave stretching from the Midwest to the Northeast. Meteorologists said residents in communities through the eastern half of the country can expect to see high temperatures past 90 degrees Fahrenheit.