Troy Roberts

Judge Herndon sentenced Darren Mack to life in prison.

The judge then offers advice to the grandmothers who are left to raise the lone survivor of this terrible ordeal, Erica Mack, now 10 years old.

The judge then offers advice to the grandmothers who are left to raise the lone survivor of this terrible ordeal, Erica Mack, now 10 years old.

The judge then offers advice to the grandmothers who are left to raise the lone survivor of this terrible ordeal, Erica Mack, now 10 years old.

I'm Troy Roberts. The Sweetheart Murders. The wheels of justice turn slowly, but I've never covered a story quite like this. It's hard to imagine that it would take more than three decades to find the killer and bring him to trial.

I'm Troy Roberts. The Sweetheart Murders. The wheels of justice turn slowly, but I've never covered a story quite like this. It's hard to imagine that it would take more than three decades to find the killer and bring him to trial.

I'm Troy Roberts. The Sweetheart Murders. The wheels of justice turn slowly, but I've never covered a story quite like this. It's hard to imagine that it would take more than three decades to find the killer and bring him to trial.

Sabrina Gonzalez's mother, Kim, and her father, George, weren't sure they'd live to see the day.

Sabrina Gonzalez's mother, Kim, and her father, George, weren't sure they'd live to see the day.

Sabrina Gonzalez's mother, Kim, and her father, George, weren't sure they'd live to see the day.

Over the decades, Andrea Gonzalez Rosenstein has remained devoted to keeping her baby sister's memory alive. Tell me about Sabrina.

Over the decades, Andrea Gonzalez Rosenstein has remained devoted to keeping her baby sister's memory alive. Tell me about Sabrina.

Over the decades, Andrea Gonzalez Rosenstein has remained devoted to keeping her baby sister's memory alive. Tell me about Sabrina.

Andrea named her firstborn Sabrina, and after having her third child, she decided to adopt three more.

Andrea named her firstborn Sabrina, and after having her third child, she decided to adopt three more.

Andrea named her firstborn Sabrina, and after having her third child, she decided to adopt three more.

Back in the summer of 1980, Andrea was already attending the University of California at Davis when her sister moved in with her. Sabrina was excited to begin her own college career. That summer, Sabrina met John Riggins while working for the town's recreation department.

Back in the summer of 1980, Andrea was already attending the University of California at Davis when her sister moved in with her. Sabrina was excited to begin her own college career. That summer, Sabrina met John Riggins while working for the town's recreation department.

Back in the summer of 1980, Andrea was already attending the University of California at Davis when her sister moved in with her. Sabrina was excited to begin her own college career. That summer, Sabrina met John Riggins while working for the town's recreation department.

John had been a popular high school athlete in Davis, but he stood out for another reason as well. When he was much younger, he had this mop of red hair that got a lot of attention.