One of the witnesses -- identified as a 17-year-old Steubenville football player and wrestler -- testified that he used his cell phone to record Mays putting his fingers inside the girl's vagina during a drive from one party to another. He said he deleted the video the next morning when he realized it was wrong.
The teen also testified that Mays later attempted to have the girl perform a sex act on him in the basement of a home.
"She didn't really respond to it," he said.
Evan Westlake, 18, a Steubenville football and baseball player, told the judge on Friday that he saw Richmond digitally penetrate the girl in the basement.
When asked by prosecutors why he didn't stop the incident, he said, "It wasn't violent. I didn't know exactly what rape was. I thought it was forcing yourself on someone."
Richmond's attorney, Walter Madison, challenged whether Westlake was trying to right a wrong through his testimony.
"I felt a lot of regret, difficult to face my family knowing they knew what I had done," Westlake testified.
Anthony Craig, 18, also testified Friday that he saw Richmond digitally penetrate the girl in the basement.
"She wasn't moving. She wasn't talking. She wasn't participating," he said.
Craig also admitted taking a nude cell phone picture of the girl while she was in the basement and showing it to friends.
"It was stupid," he said.
In earlier testimony, teens who attended some of the booze-soaked parties testified the girl appeared to be drunk, stumbling and slurring words. But on cross-examination some said she seemed able to walk and answer questions.