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Brendon O'Neal, a photographer who was on stage when a gunman sprayed bullets on a crowd attending a concert in Las Vegas Sunday night, recounted his harrowing escape and described attempts to help a stranger who had been shot in the head.

Three US scientists have won the Nobel Prize in Physiology or Medicine "for their discoveries of molecular mechanisms controlling the circadian rhythm," otherwise known as our biological clock, the Nobel committee said.

A full-strength Supreme Court will take the bench Monday for what could be the most consequential term in decades, as the ideologically split justices consider cases as diverse as religious liberty, immigration, cell phone privacy, voting rights and possibly the legality of President Donald Trump's controversial travel ban.

Country music star Jason Aldean was on stage when a gunman attacked the Route 91 Harvest Festival in Las Vegas, Nevada late Sunday night.

Country music singer Jason Aldean runs off stage when rapid-fire gun shots begin to erupt at a Las Vegas music festival.

There was defiance again, but this time it wasn't as raw.

O.J. Simpson is free on parole after serving nine years in prison for a Las Vegas armed robbery, a Nevada prison official said.

California attorney David Cook specializes in collections. His most challenging debtor: O.J. Simpson.

Vermont Sen. Bernie Sanders on Sunday rebuked President Donald Trump's decision to attack the mayor of San Juan on Twitter as Puerto Rico continues to struggle after being hit by back-to-back hurricanes.

President Donald Trump on Sunday again mocked North Korean leader Kim Jong Un and said Secretary of State Rex Tillerson should not bother trying to negotiate with him in an effort to stop the country's development of nuclear weapons.

Malcolm LaVergne, an attorney for O.J. Simpson, tells CNN's Paul Vercammen that O.J. is looking forward to "the simple pleasures in life" after he leaves prison on parole.

Michael Grimm, the former Republican congressman who went to jail for tax evasion, will announce his campaign for his old seat representing Staten Island and parts of Brooklyn in New York on Sunday morning.

On State of the Union, Gov. Kasich tells Jake Tapper that NFL players have a right to protest during games.

It used to be simpler. During World War II or when we landed a man on the moon, we swelled with national pride. Now, a "patriotism gap" separates us.

President Donald Trump launched an attack on San Juan Mayor Carmen Yulín Cruz on Saturday for criticizing the White House's hurricane relief efforts in Puerto Rico, accusing her of "poor leadership" and suggesting that the island's residents are not doing enough to help themselves.

San Juan Mayor Carmen Yulín Cruz made her message clear on her black shirt that read: "Help Us, We Are Dying."

As Tony King tells his story, he pauses often. His memory is still sharp, but the words don't come easily. Maybe it's because he is turning 92. Or maybe he just hasn't talked about that day in a very long time.

The scene is terrifying -- entire sections of a Mexico City office building fall away and crash to the ground. The screams of people reacting are almost worse.

CNN Chief Medical Correspondent Dr. Sanjay Gupta takes us inside the search for life-saving medicines to treat Puerto Ricans suffering in local clinics and shelters.