30 years ago this summer, 14-year-old Jennifer Ertman and 16-year-old Elizabeth Pena decided to take a shortcut home through T.C. Jester Park. They walked straight into unimaginable horror.

30 years ago this summer, 14-year-old Jennifer Ertman and 16-year-old Elizabeth Pena decided to take a shortcut home through T.C. Jester Park. They walked straight into unimaginable horror.

She was the glamorous River Oaks socialite who had it all. Joan Robinson Hill - striking, talented, and a national equestrian star. In the 1960's, she and her plastic surgeon husband, Dr. John Hill, were at the top of Houston society.

She was the glamorous River Oaks socialite who had it all. Joan Robinson Hill - striking, talented, and a national equestrian star. In the 1960's, she and her plastic surgeon husband, Dr. John Hill, were at the top of Houston society.

A legendary Houston police detective looks back on the shocking murders of a young family - and his years-long search for the truth.

A legendary Houston police detective looks back on the shocking murders of a young family - and his years-long search for the truth.

It's a case Houston will never forget. In the late 1990s, panic swept through railroad towns over a train-hopping serial killer who murdered his victims near tracks.

It's a case Houston will never forget. In the late 1990s, panic swept through railroad towns over a train-hopping serial killer who murdered his victims near tracks.

A husband and father found brutally murdered on the beach, a hitman behind bars, and a wife accused of orchestrating everything – vanished without a trace. Go inside the mystery and manhunt for Texas' most wanted female fugitive.

A husband and father found brutally murdered on the beach, a hitman behind bars, and a wife accused of orchestrating everything – vanished without a trace. Go inside the mystery and manhunt for Texas' most wanted female fugitive.