19-year-old Monalisa Perez from Minnesota fatally shot her boyfriend while the two filmed a video they planned to upload to YouTube, hoping that it would go viral. She tweeted, "probably going to shoot one of the most unsafe videos ever".
An air ambulance was scrambled to the scene but Mr Ruiz was pronounced dead, authorities said.
Perez had started a YouTube channel in March which aimed to show "the real life of a young couple who happen to be teen parents".
Her boyfriend responds: "I told them the bigger we get, I'll be throwing parties". "It shouldn't have happened at all".
Monalisa is now pregnant with the couple's second child.
Perez could face up to 10 years in prison, a $20,000 fine, or both.
Monalisa Perez and Pedro Ruiz III were making a youtube video when Perez held a gun to Ruiz's chest and shot him
She has been granted a public defender and released on 7,000 U.S. dollars (£5,390) bail.
"They were in love, they loved each other", Ruiz's aunt Claudia Ruiz told WDAY-TV.
Before the fatal incident, Perez tweeted about the upcoming stunt she and Pedro Ruiz were going to pull off. The Minnesota Star-Tribune reported she is also charged with second-degree manslaughter. She pointed out two GoPro cameras that had been set up - one on the back of a auto and one on a ladder.
The couple was trying to achieve YouTube fame with a prank. The couple had one child and were expecting their second together, his aunt told the news station.
On Monday, 22-year-old Pedro Ruiz III and 19-year-old Monalisa Perez set up two cameras and prepped for a unsafe stunt they thought would be their breakthrough video.
The couple's pranks attracted viewers to their YouTube channel. "Why are you going to use a gun, why?'" Ruiz told Valley News Live.
More than 100,000 people have viewed the video.
Kris Bryant leaves game with ankle injury
Strasburg worked seven innings, striking out 13. "It seems like he's getting his act back together". Strasburg (9-2) allowed three runs, two earned, and four hits in his first win against the Cubs.