A college student's troubling text messages lead investigators to her killer. "CBS Saturday Morning" co-host Michelle Miller reports for "48 Hours."

The parents of Derrick Robie, who was murdered in 1993 at the age of four, have spoken out following the release of their son's killer from prison after 28 years.

In an interview with CBS News' 48 Hours, Doreen and Dale Robie recalled their painful journey in the three decades since their son's murder in the village of Savona, New York. The little boy was killed by Eric Smith, then 13 years old, who was dubbed the "freckle-faced killer" in the media at the time.