The FBI and the U. S. Attorney's Office step into the investigation of an unarmed black teenager's death in Sanford, Florida. After hearing the 911 tapes the night their son was killed, the parents of Trayvon Martin are welcoming the feds' presence. The 17-year-old Martin was walking to his father's girlfriend's house in a gated community carrying a can of iced tea and a bag of candy when 28-year-old George Zimmerman, volunteering on neighborhood watch, spotted him and called 911.

"This guy looks like he's up to no good or he's on drugs or something," Zimmerman told the dispatcher. Ignoring the dispatcher's recommendation to wait for police, Zimmerman followed the teen. Martin, for his part, was on the phone with a 16-year-old friend and told her a strange man was watching him, so he was going to put on his hoodie; the girl urged Martin to run. She heard Martin ask the man why he was following him and says it sounded like Martin got shoved because his phone's earpiece fell to the ground.

The 911 calls from several neighbors who heard yelling reveal the sound of someone screaming for help in the background, and then what sounds like a single gunshot rings out. Martin was shot once in the chest and died. Zimmerman is claiming self-defense. He has not been arrested.

A Sandy Springs standoff ends after 12 hours when police grab the armed man off an apartment porch; the suspect is in custody and his girlfriend's infant is safe.  Police say Clinton Bailey, 33, pointed a gun at people in the leasing office of the One Sovereign Place apartment complex on Roswell Road, complaining that someone was messing with his water.  Bailey allegedly believed that the government was listening in on his conversations through the water heater in his apartment.  A seven-month-old girl inside with him was unharmed.  Police convinced Bailey to step onto the porch, then a team moved in, got the girl, and arrested him.

An early-morning robbery and shooting at a southside ATM.  Police say a man was shot in the neck at a cash machine at 5060 Old Bill Cook Road at Old National Highway. No word on his condition or any suspects.

The district attorney will decide if any charges will be filed in a deadly stabbing in Henry County.  13-year-old Malachi Andrews died last Friday.  His 14-year-old sister claimed she had stabbed him in self-defense.

A lack of education threatens national security. A task force headed up by former Sec of State Condoleezza Rice finds three out of four young adults don't qualify to serve in the military, in part because they don't have enough education.

Times are tough all over.  Oprah Winfrey's network is laying off 30 people in a restructuring of the 15-month-old OWN, and canceling Rosie O'Donnell's show.  OWN has been struggling; her interview with Bobbi Kristina pulled its highest numbers ever.