One of the graduate students who came across a former Stanford University student raping a woman behind a campus dumpster described the experience as "shocking and disturbing" in an interview Wednesday with Fox News' Greta Van Susteren.

Carl-Fredrik Arndt said he was riding his bicycle alongside a friend when they both came across Brock Turner -- a former star swimmer and Olympic hopeful -- raping an unconscious, 23-year-old woman in January 2015.

Arndt told Van Susteren in the "On The Record" interview that the woman wasn't moving when he first arrived at the scene, even as he tried to shake her. He added that she had a dress on, but it was pulled up.

"It was a horrible thing to experience for anyone," he said. "It was very shocking and disturbing."

After first briefly talking with Turner, Arndt said the then-freshman then tried to run away until he was chased down by the two men and held until campus police arrived.

When asked if he thought Turner had been intoxicated, Arndt said he "could run" and "was not sluring at all."

Arndt did not want to comment when questioned on what he thought of the California judge who gave Turner six months in jail for raping the unconscious woman, but said he wanted to speak out on what he saw because "this an important issue that people care about when it comes out."

More than 745,000 people had signed an online petition Wednesday calling for the removal of the judge, even as the jurist began a fresh term on the bench Tuesday after running unopposed.

The petition was started in response to Santa Clara County Superior Court Judge Aaron Persky's sentencing of Turner to six months in jail and ordering him to register as a sex offender following his conviction in March on three counts of sexual assault. Prosecutors were pushing for the judge to sentence Turner to six years in prison -- though the maximum sentence could have been up to 14 years.

Defense attorneys sought a four-month sentence, while probation officials suggested a six-month sentence, to which Persky ultimately agreed.

In his ruling, Persky, who also attended Stanford, cited Turner's age, no "significant" prior legal problems and said he carried "less moral culpability" because he was drunk the night of the attack.

Persky also said that state prison could have a "severe" impact on Turner's life -- a statement that has ignited national outrage.

The Change.org petition, which as of Wednesday morning had 608,240 signatures, calls for Persky's removal from the bench. Ironically, Persky began a new judicial term on Tuesday after running unopposed for his seat.

"Judge Persky failed to see that the fact that Brock Turner is a white male star athlete at a prestigious university does not entitle him to leniency," the Change.org petition reads.

"He also failed to send the message that sexual assault is against the law regardless of social class, race, gender or other factors," it says.

There also is a separate White House petition calling for Persky's impeachment. Although both petitions were likely to clear the threshhold for requiring a response from the White House, it is unclear what, if anything, the Obama administration can do about the case or the judge's term on the bench.

Turner's father, Dan Turner, added to the controversy, writing that his son's life "will never be the one that he dreamed about and worked so hard to achieve. That is a steep price to pay for 20 minutes of action out of his 20-plus years of life."

At Turner's sentencing, meanwhile, the victim read a 12-page statement in court, addressed primarily to Turner and taking him to task for not taking responsibility for his actions.

She did not criticize the university and thanked the graduate students who tackled Turner and summoned police.

"I stood there examining my body beneath the stream of water and decided, I don't want my body anymore. I was terrified of it, I didn't know what had been in it, if it had been contaminated, who had touched it," she said. "I wanted to take off my body like a jacket and leave it at the hospital with everything else."

"I don't sleep when I think about the way it could have gone if the two guys had never come. What would have happened to me?," she added. "That's what you'll never have a good answer for, that's what you can't explain even after a year."

The Associated Press contributed to this report.