December 18, 2017 07:53 PM

Mark Salling appeared in court on Monday more than two months after pleading guilty in his child pornography case.

“Mark is focused on accepting responsibility and attempting to atone for his conduct,” Salling’s attorney Michael Proctor said in a statement to PEOPLE.

Salling, 35, arrived at the Los Angeles courthouse on Monday, where he pleaded guilty to possession of child pornography involving a prepubescent minor, TMZ first reported.

His appearance comes after the Glee star — he played jock Noah “Puck” Puckerman on the hit Fox show from 2009-15 — struck a plea deal in the case in October and will be sentenced to four to seven years in prison, according to court documents obtained by PEOPLE.

Federal investigators said they found more than 25,000 images and 600 videos depicting child pornography on computers and thumb drives that belonged to Salling. The content depicted children as young as 3 years old being abused, according to court documents.

The actor has to register as a sex offender and enter a treatment program; have no verbal or electronic contact with anyone under the age of 18; stay 100 feet away from schools, parks, public swimming pools, youth centers, playgrounds and arcades; and pay $50,000 in restitution to each victim, according to the documents.

WATCH: Glee Star Mark Salling Arrested for Child Pornography

Salling was arrested in December 2015 after investigators said the laptop, a hard drive, and a USB flash drive seized from his residence allegedly contained thousands of images and videos depicting child pornography. (His former girlfriend called police, according to the court documents.)

In May 2016, he was named in a two-count indictment alleging he received porn involving young girls. But the trial was delayed that June as he sought new legal representation.

The U.S. Attorney’s office predicts that it will be at least another three months before Salling is sentenced.

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