Hearts are strewn from its light poles, businesses build their brands around its "sweet" nickname and, every February, valentines pour into the city from all around the world. So what, or who, made Loveland, Colorado the nation's "Sweetheart City"?

Gary Hinman wasn't a celebrity. He wasn't a young Hollywood type. He was a boy from Fort Collins. And, in the summer of 1969, he became the Manson family's first victim.

Gary Hinman wasn't a celebrity. He wasn't a young Hollywood type. He was a boy from Fort Collins. And, in the summer of 1969, he became the Manson family's first victim.

On December 14, 1961, a passenger train collided with a school bus, killing 20 children just outside Greeley, Colorado. Their lives ended that cold morning. Their stories, however, did not.

On December 14, 1961, a passenger train collided with a school bus, killing 20 children just outside Greeley, Colorado. Their lives ended that cold morning. Their stories, however, did not.

Before the big box stores of Harmony Road, a tiny farming community spanned the desolate stretches of what was once Northern Colorado's no man's land.

Before the big box stores of Harmony Road, a tiny farming community spanned the desolate stretches of what was once Northern Colorado's no man's land.

For almost three decades, Doris and Allen Sorenson were Windsor, Colorado's jewelers. In the 33 years since early November 1984, they've been its biggest mystery.

In this episode, we dig into the Sorenson murders, Windsor's oldest cold case homicides.

For almost three decades, Doris and Allen Sorenson were Windsor, Colorado's jewelers. In the 33 years since early November 1984, they've been its biggest mystery.

In this episode, we dig into the Sorenson murders, Windsor's oldest cold case homicides.

On July 4, 1899, the townspeople of tiny Windsor, Colorado watched as their beloved flour mill burned. More than a century later, this past August, they had to again. Only this time, they were faced with a new question. Who set it on fire?