Another murder story that dominated headlines in 2009 and made the list of most-read stories was the case of the so-called "Craigslist Killer." In April, a Boston man, Philip Markoff, received the moniker after he allegedly used Craigslist to arrange meetings to rob women who posted erotic ads on the Web site. One of his alleged victims, Julissa Brisman, was murdered during the robbery.
Markoff pleaded not guilty to a murder charge and to the armed robbery of another woman, as well as kidnapping and weapons charges.
Read the story: 'Craigslist Killer' May Never See Fiancee Again.
The confessions some teenagers shared in a documentary about teens and sex shocked parents around the United States and sparked a huge reaction when a segment on the documentary aired on "Good Morning America."
"I ended up having sex with more than one person that night and then, in the morning, I was trying to get morning-after pills," one of the girls said. "I was, like, 14 at the time."
It's just one of dozens of stories from teenage girls in a new documentary by Canadian filmmaker Sharlene Azam that aims to shed light on the secret, extremely sexual lives of today's teens.
After four years researching for the documentary, Azam told "Good Morning America" in May that oral sex is as common as kissing for teens and that casual prostitution -- being paid at parties to strip, give sexual favors or have sex -- is far more commonplace than once believed.
"If you talk to teens [about oral sex] they'll tell you it's not a big deal," Azam said. "In fact, they don't consider it sex. They don't consider a lot of things sex."
Read the story: Teens: Oral Sex, Casual Prostitution No Biggie.
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In her book "Madoff's Other Secret: Love, Money, Bernie and Me," Sheryl Weinstein reveals the details of her purported affair with convicted Ponzi schemer Bernard Madoff, who she says was in love with her and was "a good kisser."
"He really got into it more emotionally than he expected to," Weinstein said of the affair for the first time on television on "Good Morning America", Aug. 25, 2009. "I think he loved me and was very afraid of that type of connection," she said.
Read the story: Bernie Madoff 'Mistress' Tells All: 'He Was a Good Kisser.'
Read an excerpt of the book: 'Madoff's Other Secret: Love, Money, Bernie and Me'.
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In an interview on "Good Morning America" in February 2009, former President Bill Clinton gave President Barack Obama an "A" for his first month in office, but said that Obama needed to put on a more positive face when speaking to the American people about the economy.
"Look, the American people, I think, know the president has tried to reach out to Republicans," Clinton told ABC News' Chris Cuomo. "And it takes two to tango. I think there are some of them who really believe that just-say-no politics is good politics.