His mother’s name is Dong. No more needs to be said.

HILLSBORO, Oregon — Serial thief Sung Goo Kim pleaded guilty Tuesday to child pornography and burglary charges in Washington County, doubling the time he will spend in prison.

After a week of negotiations and a change of heart minutes before his trial was to start, the 31-year-old Tigard man agreed to a sentence of four years and four months. Kim also will be required to register as a sex offender for 10 years after his release.

Last month in Yamhill County, Kim was sentenced to four years and two months in prison after entering guilty pleas to theft and burglary charges. That sentence will run before his Washington County sentence begins.

Kim was accused of stealing thousands of pairs of underwear and other clothing from female students on or near college campuses throughout the Willamette Valley, including Forest Grove’s Pacific University between January 2003 and May 2004. Besides Washington and Yamhill counties, he was charged in Multnomah and Benton counties.

“I’m very pleased Mr. Kim finally stepped up and admitted his responsibility for these crimes he committed,” said Jeff Lesowski, Washington County senior deputy district attorney. “These are very invasive and frightening crimes for these young women to deal with.”

At Tuesday’s hearing, Kim pleaded guilty to one count of second-degree encouraging child sexual abuse and five counts of first-degree burglary, all felonies.

Lesowski said Multnomah County prosecutors agreed not to add any more consecutive prison time if he pleads guilty to burglary and theft charges in Portland next month.

Kim still faces charges in Benton County, where prosecutors did not agree to the same deal.

Wearing the orange-and-white striped uniform of a Washington County Jail maximum security prisoner instead of the business suit he wanted to wear, Kim answered Circuit Judge Donald Letourneau with short respectful replies. He paused when Letourneau asked him whether he had any questions.

“I may have questions later on since this is a complicated case, but I do understand,” Kim said.

Private defense attorney Clayton Lance said Kim and his family were concerned that he has to register as a sex offender for 10 years and that he will get what amounts to a 10-year sentence for nonviolent property crimes.

With credit for good behavior and time served since his May 2004 arrest, Kim may end up spending about five years in the state penitentiary. After that, he will receive 18 months of mental health treatment through a Yamhill County Jail program.

“It’s very hard for this family to look at this young man who has no criminal history, no brush with the law, who is stealing panties out of laundries and see he’s doing a tremendous sentence,” Lance said after the plea hearing.

Dong Kim, the defendant’s mother, argued that her son needs mental health treatment, not punishment. She said the family thought any plea deals after the Yamhill County sentence would not add to Kim’s prison time.

“No parent wants to see their child on trial,” Dong Kim said. “We wanted to just settle, but we wanted a reasonable sentence.”

At one point, authorities labeled Kim a person of interest in the May 2004 abduction of Brooke Wilberger from a Corvallis apartment complex. Kim was charged with stealing women’s underwear from the same apartments, but he was cleared in the disappearance. A New Mexico man has been charged with aggravated murder in the Wilberger case.

Washington County was the only jurisdiction to charge Kim with a sex offense: having child pornography on his home computer.

While searching Kim’s bedroom in his parents’ home in the 13100 block of Southwest Bouneff Street in Tigard, police said they found a computer with more than 44,000 pornographic images involving the torture, rape, mutilation and killing of women.

Lance said eight of the thousands of images were of children. He acknowledged that Kim has a “fetish,” but said the defendant inadvertently downloaded the child porn while getting legal adult images off the Internet.

Lesowski said he could have proven at trial that Kim “deliberately moved images of child porn from file to file and, in some cases, onto different hard drives.”

Police searching Kim’s room also found bags and boxes of underwear, dryer lint, human hair and female hygiene products labeled with dates and the names of area colleges and women connected to the items.

Lesowski said the number of stolen items, such attention to detail and Kim’s fixation on the women made the defendant much more than “just a panty thief.”