The domestic violence charges against Aron Ralston, the hiker who was forced to amputate part of his own arm to free himself from a boulder under which he'd been trapped, have reportedly been dismissed.

Ralston was arrested Sunday on allegations of domestic violence.

According to KDVR.com, court records showed that Ralston, 38, was booked into the Denver County Jail on misdemeanor charges of assault and wrongs to minors. Police say he and his girlfriend, Vita Shannon, got into an altercation.

Police said the second charge is used when children are present during an incident but not necessarily hurt. Police documents say their 8-week-old child was present at the time of the alleged altercation.

There was no indication the infant was hurt. Family members said Shannon's mother has been caring for the child since the couple's arrest.

The documents had alleged Shannon struck Ralston twice in the back of the head with her fists and that he shoved her as she was leaving her apartment. The documents say they were arguing over another child of Ralston's.

The couple, both are 38, had been scheduled to appear in court later Monday.

"We're saddened that this would happen, evolve this way," said Ralston's father, Larry Ralston. "We're hopeful that things will work out."

Larry Ralston said his son and Shannon had "a heated argument."

Ralston cut off his forearm to free himself from a dislodged boulder in a Utah canyon in 2003.

He was "canyoneering" -- making his way down a narrow canyon -- at the time. After five days with little food and water, he broke his arm and then amputated it with a dull knife to escape.

He detailed his struggles in a book, "Between a Rock and Hard Place," which was adapted into the Oscar-nominated "127 Hours."

Ralston became a celebrity, making inspirational speeches and championing environmental causes.

He also continued his adventurous life using prosthetics he helped develop. He completed a nine-year project to scale the highest point in all 50 states and became the first person to solo climb all 59 of Colorado's 14,000-foot peaks in winter.

The Associated Press contributed to this report.

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