These videos were produced by PBS' "Frontline."

Shirley Ree Smith, who was convicted of second-degree murder for shaking her 7-week-old grandson to death, speaks to ProPublica's A.C. Thompson. Her conviction was overturned, but then reinstated by the U.S. Supreme Court. Now Smith, 51, faces a possible return to prison. Meanwhile, new doubts out of the Los Angeles County coroner's office raise more questions about her case. | Related story: New Evidence in High Profile Shaken Baby Case

'It's a Good Thing'

Shirley Ree Smith reacts to new doubts from the coroner's office on her conviction. "I wouldn't even be in this predicament if he was here 15 years ago, 16 years ago," she said. "I wouldn't be going through this."

'Finally Justice Was Served'

Shirley Ree Smith tells correspondent A.C. Thompson her reaction when the 9th Circuit Court of Appeals overturned her conviction on charges that she killed her grandson by shaking him to death. "They saw the facts and went on the facts, which no one else did," she said.

'Free, But Not Really Free'

Fifteen years ago, Shirley Ree Smith was convicted of shaking her grandson to death, but the facts were murky and she always maintained she's innocent. Her conviction was overturned, but then reinstated by the U.S. Supreme Court. She tells FRONTLINE correspondent A.C. Thompson what it's like to live in legal limbo.