In the "Misogynism" video, he spoke about a woman who kept canceling and rescheduling dates, saying he "could have ripped her head off". Court records show he asked a woman sunbathing by the pool if he could rub sunscreen on her buttocks.
They also identified the shooter as 40-year-old Scott Paul Beierle, whose motive is still unknown.
Authorities have not identified the shooter or any of the victims.
Scott Paul Beierle, 40, opened fire at the yoga studio in Tallahassee on Friday evening, killing 21-year-old Maura Binkley and 61-year-old Van Vessem before wounding five others and killing himself, officials said. Four women and one man suffered non-life-threatening injuries.
TPD says they responded to a shooting at the Hot Yoga in the Betton Hills Complex on Bradford Road around 5:37 p.m.
The gunman, who was already dead when officers arrived, died of a self-inflicted gunshot wound, the police chief said in a statement Saturday.
Florida State University President John Thrasher said Van Vessem and Binkley had ties to the university, the Democrat reported. He had been charged with battery twice, and multiple news outlets have reported on evidence of his misogynist and racist beliefs.
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All of Beierle's original videos were removed from YouTube after Buzzfeed News published its story, but a video posted to YouTube on Saturday appears to be a duplicate of one of Beierle's original video rants.
In the videos, Beierle pontificated from a dimly lit bedroom, with an unmade bed and a pile of cardboard boxes in the background.
Some teachers wondered what they would tell their students. But Beierle's online emphasis on romantic rejection - and his reference to Elliot Rodger - does call to mind the group of men on the Internet who term themselves "incels", which is short for "involuntarily celibate".
"Casey and I are praying for the families", he said. Records show that the charges were eventually dismissed after Beierle followed the conditions of a deferred prosecution agreement.
The 2012 incident happened in a dining hall on Florida State's campus. He offered to put sunscreen on her buttocks, but she told him no and he groped her without her permission, according to the police report. Police said the studio appeared to have been picked as a target at random.
During a media briefing night, Tallahassee Police Chief Michael DeLeo confirmed all four surviving victims are in critical condition. He graduated from the school, they said.
"We just heard 'pow, pow, pow, pow, '" Wesson said.
She grew up in the Atlanta area and was attending Florida State University, where she was a member of the Delta Delta Delta sorority.
The Tallahassee Democrat newspaper said Van Vessem also worked as chief medical director for Capital Health Plan, which in a statement described her as a "guiding, visionary force" and "one of the most respected, inspiring, and accomplished medical professionals in the state and country".