Elizabeth Vargas

Derek Hasem had been stabbed 36 times. Nancy, six. Her body was found in the kitchen. Both were stabbed in the heart. Both nearly decapitated.

Derek Hasem had been stabbed 36 times. Nancy, six. Her body was found in the kitchen. Both were stabbed in the heart. Both nearly decapitated.

Whodunit theories are rampant. Word that Derek Hasem upset workers in the steel business fuels rumors of a mafia-style hit. But a clue in a rental car agreement is about to change the direction of the case.

Whodunit theories are rampant. Word that Derek Hasem upset workers in the steel business fuels rumors of a mafia-style hit. But a clue in a rental car agreement is about to change the direction of the case.

Stay with us. Washington, D.C., it's the 1980s. Reagan... and the Redskins are in their heyday. And speaking of time warps, it's the midnight showing of the Rocky Horror Picture Show. It's become a staple here in Georgetown, the center of the nightlife.

Stay with us. Washington, D.C., it's the 1980s. Reagan... and the Redskins are in their heyday. And speaking of time warps, it's the midnight showing of the Rocky Horror Picture Show. It's become a staple here in Georgetown, the center of the nightlife.

And it's at one of those showings 200 miles away from the Hasems' home in Bedford County, Virginia, near Lynchburg, where Elizabeth Hasem says she was when her parents were murdered. An alibi with her boyfriend in tow.

And it's at one of those showings 200 miles away from the Hasems' home in Bedford County, Virginia, near Lynchburg, where Elizabeth Hasem says she was when her parents were murdered. An alibi with her boyfriend in tow.

And what do they do while they're in Washington, D.C.?

And what do they do while they're in Washington, D.C.?

The films were stranger than paradise, and ironically, witness.

The films were stranger than paradise, and ironically, witness.

One of those room service deliveries, food for two, was right around the time police believe Elizabeth's parents were murdered. What did she say about her relationship with her parents?

One of those room service deliveries, food for two, was right around the time police believe Elizabeth's parents were murdered. What did she say about her relationship with her parents?

But Elizabeth's uncle, Lou Benedict, Nancy Hasem's younger brother, says the relationship between mother and daughter wasn't as rosy as Elizabeth described it.

But Elizabeth's uncle, Lou Benedict, Nancy Hasem's younger brother, says the relationship between mother and daughter wasn't as rosy as Elizabeth described it.

And Elizabeth's parents didn't appear to be happy with their daughter's new boyfriend, Jens Ziering.

And Elizabeth's parents didn't appear to be happy with their daughter's new boyfriend, Jens Ziering.

As police continue their investigation into the Hasems' double murder, they find the agreement for the rental car Elizabeth says she and Jens used that weekend. This is the rental car agreement.

As police continue their investigation into the Hasems' double murder, they find the agreement for the rental car Elizabeth says she and Jens used that weekend. This is the rental car agreement.