The doctor of NBC's Tim Russert has said that the veteran journailst died at age 58 Friday after plaque ruptured an artery, causing a sudden coronary thrombosis.Russert suffered what is called sudden cardiac death or the unexpected natural death from a cardiac cause which occurs within a short time period, usually less than an hour from the onset of symptoms.

Heart disease is the No. 1 killer of both men and women in the United States. Centers for Disease Control and Prevention

Dr. Manny Alvarez serves as Fox News Channel's senior managing health editor. He also serves as chairman of the department of obstetrics/gynecology and reproductive science at Hackensack University Medical Center in New Jersey. Click here for more information on Dr. Manny's work with Hackensack University Medical Center. Visit AskDrManny.com for more.