Lisa Guerrero

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ABC's Jennifer Ashton Says She Didn’t See Warning Signs of Ex-Husband’s Suicide
01:47 — ABC News' Chief Medical Correspondent Dr. Jennifer Ashton is used to helping others, but now she's using a painful time in her own life to do it.
16-Year-Old Pushes Man in Wheelchair Away From Missouri Tornado
01:29 — In the wake of devastating twisters that carved a path of destruction through America’s heartland comes news of an act of kindness.
Who’s the Man Who Allegedly Pulled Brakes on New York City Subway Trains?
01:38 — Meet the man police say brought the world's biggest subway system to a screeching halt.
Soldiers Place Flags at Arlington National Cemetery Graves for Memorial Day
01:07 — As Memorial Day approaches, every service member buried at Arlington National Cemetery is honored by having a flag placed on their grave.

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Ranking Big Bang Theory's Guest Stars

From Stan Lee to Leonard Nimoy, check out the greatest cameos on the CBS sitcom

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