SEATTLE -- The Green River Task Force opened its south Seattle headquarters to reporters Friday, revealing the room where Gary Ridgway stayed during months of questioning that led to his guilty pleas.

GREEN RIVER MURDERS CASE Complete Coverage Of The Case EXTENDED INTERVIEW: Judith Ridgway Shares Her Story Slideshow: Images From The Courtroom Slideshow: Ridgway At Crime Scenes Timeline: Key Moments In The Case Discuss: Your Thoughts On Plea Deal Photo Gallery: Ridgway, Victims, Police Investigation Video: Gruesome Details In Ridgway's Confession Survey: Support Plea Bargain? Court Documents On King County Website

KIRO Team 7 Investigators broke the story last summer, reporting that Gary Ridgway was being held at Task Force headquarters, near Boeing Field. [See the full story.]

Ridgway was kept in a plain, ten-by-12-foot room with a mattress on the floor. He slept on a mattress and had a desk and chair. There was a motion detector and video camera watching him 24 hours a day.

Nearby, for nearly five months and up to 14 hours a day, Gary Ridgway sat in a blue plastic chair and detectives sat in black cushioned chairs as Ridgway confessed to 48 murders.

"Understand there was no emotion shown by him. This was a man who liked control, a word used a lot in this room," said Randy Mullinax, a detective with the Green River Task Force.

Detectives recorded the interviews. A few rooms away, another team of detectives watched and worked to corroborate what Ridgway said.

Video

Inside GRK Task Force HQ

Posters with the faces of his victims hung on the wall, but it was a pictures and video shown on a screen that were most effective.

"He was not good with the victims by face, but he did remember where he put them," Mullinax said.

"A lot of long hours, a lot of things were frustrating. After 5 1/2 months we know him pretty well and he knows us pretty well," said Sue Peters.