Austin, Texas | Sept. 1999
In the weeks following the brutal December 1991 murders of four teenage girls in an Austin, Texas yogurt shop, [the girls had been tied up, stripped down - at least one was raped - shot in the head and their naked bodies were stacked in a corner then set on fire] authorities interrogated teenagers Maurice Pierce, Michael Scott, Robert Springsteen and Forrest Welborn after Pierce was caught with a gun at a local mall shortly after the crime.
With no solid evidence they were let go.
There were no developments in the case until 1999, when new detectives on the case made the stunning announcement that they made four arrests.
More shocking was the news that it was the same four teenagers - now in their 20s - who police had spoken with eight years earlier.
After being questioned by police this time, Michael Scott and Robert Springsteen confessed to the murders.
Charges against Forrest Welborn and Maurice Pierce were dropped.
Scott and Springsteen each stood trial for murder and both were convicted; Springsteen was condemned to death row and Scott sentenced to life in prison.
But this case, which was full of unexpected twists, was far from over.
Find out what happens next on the next 48 Hours | Mystery, "Innocence Lost," Saturday, Jan. 9 at 10 p.m. ET/PT.