Christopher Elwell, 29, was given a maximum sentence of 15 years in prison for sexually assaulting a four-year-old-girl. The assault took place earlier this year in Mineral Park Drive in Dover, New Hampshire, USA.
Within minutes of hearing the judge's verdict at the courtroom, Elwell sat down - only to be attacked by Josiah Davies, who was also in court awaiting a hearing on a probation violation.
Davies, who was actually shackled at the time, began to headbutt him multiple times before he was stopped by officers.
WARNING: GRAPHIC FOOTAGE
Elwell had been charged in June and, after initially denying the accusations, later pleaded guilty. He had been staying in the same room as four children at a sleepover when he started watching porn on his phone. He claimed the four-year-old victim had told him that she wanted to imitate what she had seen on the video.
He also pleaded guilty for failing to register as a sex offender, after being convicted on a different charge back in 2008.
"The defendant was required to register as a sex offender. He had been living at 12 Mineral Park Dr. off and on - but more than five times a month - and had not changed his registration with the Somersworth Police Department," Prosecutor Emily Conant said.
Conant said he received seven-and-a-half years to 15 years in prison, with a possibility of having one year suspended if he takes part in a sex offender programme. He is also not allowed to have unsupervised contact with juveniles.
The victim's mother, however, told Conant that she wishes Elwell had been given a longer sentence, reports WMUR, as she didn't believe Elwell will stop assaulting young girls.
But the judge seemed reluctant to accept the mother's plea bargain, because by doing so it would spare the young victim the pain of testifying during trial, and being forced to relive the events.
Josiah Davies, the man who attacked Elwell, had been arrested in Rochester for forgery and violation of probation. He was in court for a dispositional conference, but this had to be moved back because of the attack.
At this stage it is not known if charges have been filed against Davies but, according to WMUR, the courtroom incident is under investigation by the Strafford County Sheriff's Office. Conant also said that Davies could face three-and-a-half to seven years in prison for it.
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