ABC News Video: 20/20

Part 3: "Don't react off of love ...Love is so blind," she told Diane Sawyer.

Part 2: After incident, pop star said love for Brown clouded her judgment.

Part 1: Superstar breaks silence to Diane Sawyer about boyfriend Chris Brown.

Brian Ross investigates what brought Maj. Nidal Hasan to allegedly open fire.

Alleged shooter Maj. Nidal Malik Hasan killed 13 and wounded more than 30.

Pop star discusses how ex-boyfriend Chris Brown turned on her in brutal attack.

For the first time, Rihanna tells her story. Thursday on GMA, Friday on 20/20.

Family of dying woman accuse two of her 'friends' of running con to get house.

Part 1: In 1989, Melanie Melanson, 14, went to forest party. She never returned.

Part 5: Decades after rape and murder of N.H. girl, investigation builds steam.

Part 4: Kathy Gloddy, 13, went for ice cream. A day later she was found dead.

Part 5: Decades after rape and murder of N.H. girl, investigation builds steam.

Part 6: Family believes man's statement to cops was mark of dirty conscience.

Part 6: Family believes man's statement to cops was mark of dirty conscience.

Part 3: "It's just been harassment for 20 years," says one about cold case hunt.

Part 3: "It's just been harassment for 20 years," says one about cold case hunt.

Part 2: New information in 20-year-old case leads police to open fresh search.

Part 2: New information in 20-year-old case leads police to open fresh search.

Part 1: In 1989, Melanie Melanson, 14, went to forest party. She never returned.