Two Nevada teens have been arrested for allegedly fatally stabbing a man and burning the body in a house fire.

Aaron Guerrero, 18, and Sierra Halseth, 16, are under arrest for the murder of Daniel Halseth, Sierra's father. The pair have a mountain of evidence against them: they had planned to run away together, causing Halseth's parents to forbid them from seeing each other. They were seen on a surveillance camera buying bleach, lighter fluid, a saw, and disposable gloves. Blood and tissue were found on the saw they bought. When they were found in Salt Lake City, police found a bloody blanket in the back of the car.

Still, no piece of evidence is as damning as a video the pair took where Guerrero says, "Welcome back to our YouTube channel: day three after murdering somebody." He then goes on to playfully slap Halseth and choke her.

It is unclear if the video was intended to get to YouTube, but it was shared widely online.

The pair face eight additional charges including conspiracy to commit murder, arson, credit-card fraud, and robbery. While Halseth is too young to be considered for the death penalty, prosecutors are weighing whether to seek it for Guerrero.