Television's most powerful moments

Smoke billows from the North and South Towers of the World Trade Center before they collapsed on September 11, 2001 in New York, NY. (AP)

A three-year-old John F. Kennedy Jr. salutes his father's casket in Washington in this Nov. 25, 1963 file photo, three days after the president was assassinated in Dallas. Widow Jacqueline Kennedy, center, and daughter Caroline Kennedy are accompanied by the late president's brothers Sen. Edward Kennedy, left, and Attorney General Robert Kennedy. (AP)

Floodwaters from Hurricane Katrina pour through a levee along Inner Harbor Navigaional Canal near downtown New Orleans, La., Tuesday, Aug. 30, 2005, a day after Katrina passed through the city. (AP)

Defendant O.J. Simpson reacts after the court clerk announces that Simpson was found not guilty of the murders of Nicole Simpson and Ronald Goldman, as defense attorneys F. Lee Bailey (L) and Johnnie Cochran, Jr. (R) look on in a Los Angeles courtroom, October 3, 1995. (REUTERS)

File picture from January 28, 1986, shows the explosion of space shuttle Challenger over Cape Canaveral, Florida. The space shuttle with seven astronauts on board exploded 74 seconds after launch, all were killed. (AP)

US President Barack Obama is pictured after announcing live on television the death of Osama bin Laden, from the East Room of the White House in Washington May 1, 2011. Al Qaeda leader Osama bin Laden was killed on Sunday in a firefight with U.S. forces in Pakistan and his body was recovered, Obama announced on Sunday. (REUTERS)

A woman named Yuko Sugimoto, wrapped up in a blanket stands in the middle of rubble, looking at the city submerged under water in Ishinomaki in Miyagi Prefecture (state), two days after the catastrophic earthquake-triggered tsunami hit the northeastern Japan. (AP)

This aerial shows the news media compound near Columbine High School in Littleton, Colo., Wednesday, April 21, 1999. Media from around the world poured into the area after 15 people were killed during a shooting spree inside the school. (AP)

Battle a fire at the off shore oil rig Deepwater Horizon April 21, 2010 in the Gulf of Mexico off the coast of Louisiana. Multiple Coast Guard helicopters, planes and cutters responded to rescue the Deepwater Horizons 126 person crew after an explosion and fire caused the crew to evacuate. (GETTY/GALLO)

Earl Spencer, Prince William, Prince Harry and Prince Charles watch as the coffin of Diana, Princess of Wales is placed into a hearse at Westminster Abbey following her funeral service, September 6, 1997. Millions of mourners lined the route to pay their respects. (REUTERS)

On March 22, 2012 Houston drowned, but her death was also caused by heart disease and cocaine use that suggested she was chronically using the drug. Houston died Feb. 11, in California at the age of 48. (AP)

A frame grab from Al Iraqiya television shows a piece of cloth being placed around former Iraqi president Saddam Hussein's neck moments before his execution in Baghdad December 30, 2006. (REUTERS)

Britain's Prince William and his wife Catherine, Duchess of Cambridge, kiss as they stand next to bridesmaids Grace van Cutsem (L) and Margarita Armstrong-Jones (R) on the balcony at Buckingham Palace with other members of the Royal Family, after their wedding in Westminster Abbey, in central London April 29, 2011. (REUTERS)

President and Mrs. John F. Kennedy, and Texas Governor John Connally ride through Dallas moments before Kennedy was assassinated, November 22, 1963. (REUTERS)

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