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At 10.26 a.m., Wallace sends this text message to his boss. Package delivered. The cash is dropped, but for some reason, that doesn't stop the crime. Police say the killing begins.

Authorities will later piece together the family's terrifying final moments alive. The three adults, Savan, Amy Savopoulos, and Vera Figueroa, are held in an upstairs bedroom. The little boy, Phillip, separated from the grown-ups in another bedroom.

Authorities will later piece together the family's terrifying final moments alive. The three adults, Savan, Amy Savopoulos, and Vera Figueroa, are held in an upstairs bedroom. The little boy, Phillip, separated from the grown-ups in another bedroom.

Authorities will later piece together the family's terrifying final moments alive. The three adults, Savan, Amy Savopoulos, and Vera Figueroa, are held in an upstairs bedroom. The little boy, Phillip, separated from the grown-ups in another bedroom.

With the house on fire, the killer flees.

With the house on fire, the killer flees.

With the house on fire, the killer flees.

Before the fire can spread to where the adults are, the fire department gets the alarm. It's 1.30 p.m. on Thursday. The story blows up.

Before the fire can spread to where the adults are, the fire department gets the alarm. It's 1.30 p.m. on Thursday. The story blows up.

Before the fire can spread to where the adults are, the fire department gets the alarm. It's 1.30 p.m. on Thursday. The story blows up.

The media descends on the neighborhood. Crime scene investigators have been here all day long. Early that afternoon, someone notices Amy Savopoulos' blue Porsche is missing from the house. Police ask the public for help, but it wasn't hard to find. Just follow the smoke, the Porsche torched in a church parking lot in Maryland.

The media descends on the neighborhood. Crime scene investigators have been here all day long. Early that afternoon, someone notices Amy Savopoulos' blue Porsche is missing from the house. Police ask the public for help, but it wasn't hard to find. Just follow the smoke, the Porsche torched in a church parking lot in Maryland.

The media descends on the neighborhood. Crime scene investigators have been here all day long. Early that afternoon, someone notices Amy Savopoulos' blue Porsche is missing from the house. Police ask the public for help, but it wasn't hard to find. Just follow the smoke, the Porsche torched in a church parking lot in Maryland.

Back at the mansion, authorities are already sifting through the grisly scene. How much more difficult is it for them to try to figure this out with that house being burned so badly?

Back at the mansion, authorities are already sifting through the grisly scene. How much more difficult is it for them to try to figure this out with that house being burned so badly?

Back at the mansion, authorities are already sifting through the grisly scene. How much more difficult is it for them to try to figure this out with that house being burned so badly?

When we come back, a microscopic clue in the strangest place and the daring late night manhunt and takedown. U.S. Marshals tell us they're forced to do something they've never tried before. And he said, move, go, go, go. Stay with us.

When we come back, a microscopic clue in the strangest place and the daring late night manhunt and takedown. U.S. Marshals tell us they're forced to do something they've never tried before. And he said, move, go, go, go. Stay with us.

When we come back, a microscopic clue in the strangest place and the daring late night manhunt and takedown. U.S. Marshals tell us they're forced to do something they've never tried before. And he said, move, go, go, go. Stay with us.

She is manipulating us. Breathe in. Breathe out.