Celebrity: The couple hoped that the stunt would make them YouTube celebrities.
19-year-old Monalisa Perez, a small YouTube vlogger, fatally shot her boyfriend, 22-year-old Pedro Ruiz III, during a stunt for their channel at their home in Halstad, Minnesota.
When she shot into the book he held in front of his chest, however, the bullet did go through and pierced his chest, killing him.
The incident was caught on two separate cameras which authorities are now reviewing.
Ruiz was declared dead at the scene. Instead, the bullet struck Ruiz in the chest while the couple's 3-year-old daughter watched on.
Perez, who was charged with second-degree manslaughter, is also now pregnant with a boy due in September.
Inspired by popular prank channels, Monalisa and Pedro's stunts had been escalating to garner attention.
'They were in love. Police were able to locate a gold Desert Eagle.50 caliber pistol on the grass near the house and secured the firearm.
The victim's aunt, Claudia Ruiz, told WDAY-TV that she told her nephew: 'Don't do it.
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'I wish they wouldn't have done it, ' she said. "I wish he would've just done another prank".
Perez had shown her a different book he'd shot, that didn't go all the way through, according to the complaint.
"He had told me about an idea". She's now pregnant with Ruiz's baby, whom will be born in several months.
Around 6:30 p.m. Monday, the Norman County Sheriff's Office was called to the 500 block of U.S. Highway 75 in Halstad on a report of a shooting.
She said he replied, "Because we want more viewers, we want to get, you know, famous".
"We're going to name it Pedro, I want my name to carry on".
They were trying to achieve YouTube fame.
Perez is facing a maximum sentence of more than ten years in jail or to pay a fine of not more than $20,000 or both.