Thailand's authorities recently closed an investigation on the most notorious serial killer in the country's history: Sararat Rangsiwuthaporn, commonly called "Am Cyanide," poisoned more than 14 people in a murder spree that left local police baffled -- until they learned the full story.

CLASSIC: What on Earth is happening to Britney Spears?
1:10:00

Assault and Murder: The Grand Conspiracy of Military Cover-ups
1:01:39

CLASSIC: Foreign Investment and the Housing Crisis
1:19:52