Christopher Eric Giles, 23, of Albuquerque, N.M.
Mr Free, an English internet personality, is a member of Rooster Teeth, an Austin-based production company, and is also the creator of the Slow Mo Guys YouTube channel along with Daniel Gruchy. Giles' phone contained "more than 1000 notes" about the couple, one of which read that "I want Gavin Free to die alone, with no children".
Investigators later found that Giles had "developed a fondness" for 30-year-old Turney, but despised Free.
Police described Giles as being a "single, lonely and disturbed", individual.
Police said Giles broke into the premises at 3:40 a.m. CT on January 26, and the incident was captured on surveillance cameras. The couple awoke to the sound of a gunshot and shattering glass, before hearing someone enter the house through the back door.
Austin officers encountered Giles as he was backing out of the couple's driveway in a Lincoln sedan, the warrant says. When he couldn't locate them, Giles reportedly returned to his auto, but as he was backing out of the home's driveway, officers with the Austin Police Department arrived.
Giles was pronounced dead at the scene, with an initial report from the medical examiner indicated he died of a self-inflicted gunshot.
Nothing was stolen from the couple's house, the warrant says.
"Based on the footage seen it was apparent that Giles' sole intent was to cause harm to someone who resides there", the detective wrote in the complaint.
Documents show Giles had numerous notes on his phone about Turney - who has video blogs on anime and relationship advice - and her boyfriend, Free - who co-hosts a YouTube series featuring slow-motion videos. "It's been a rough time for Meg and myself the last few weeks but we are doing ok".
"Thank y'all so, so much for each and every kind message today and a special thank you to the @Austin_Police for their quick response that night and their ongoing support during this hard time".
The couple thanked their social media following for their support over the incident.