During taped interviews, Matthew Hoffman told detectives he thought he was crazy and claimed he could not remember fatally stabbing three people and kidnapping a 13-year-old girl.
10TV News spent hours reviewing videotaped interviews between Hoffman and investigators as he transitioned from the silent treatment, to tears, to claims of loss of memory.
After days of interrogation, Hoffman admitted to fatally stabbing Tina Herrmann, 32; her son, Kody Maynard, 11; and family friend, Stephanie Sprang, 41.
The three were killed on Nov. 10 at Herrmann's King Beach Drive home, but their bodies were not found until Nov. 18, after an intense search that made national headlines.
The day Hoffman was arrested he gave investigators the silent treatment, and resorted to what appeared to be sign language, 10TV's Maureen Kocot reported on Wednesday.
On Nov. 15, an FBI agent broke Hoffman's silence.
SLIDESHOWS: Inside Hoffman's House | Hoffman At Walmart (Suveillance Video) Knox County Trees | Bodies Found | Hoffman In Court | Case Timeline | Park Search | Images From Mount Vernon Neighborhood | Four Missing
"I think I'm crazy," he told the agent. "I (inaudible) do something bad. I wouldn't be here if I didn't. I'm afraid to even know what it was I did."
The recordings revealed emotional interviews with Hoffman as detectives pleaded with him to disclose the location of the bodies.
For two days, Hoffman remained adamant that he could not remember.
"I would help you guys if I could," Hoffman said. "I don't know. I can't think of it."
Two days later Hoffman told his attorney that investigators would find the victim's dismembered bodies inside a hollowed out tree in rural Knox County.
10TV News also obtained video taken by investigators inside of Hoffman's home that showed bags of leaves lining the walls of the house.
The video also showed the 13-year-old girl's makeshift bed in the basement, which was a pile of leaves covered in blankets.
In exchange for his cooperation, and a detailed confession, prosecutors agreed not to seek the death penalty.
Hoffman pleaded guilty to all charges on Jan. 6. He faced a total of 10 counts, including aggravated murder, gross abuse of a corpse, burglary, kidnapping and raping the teenage girl. He was sentenced to live in prison with no possibility of parole.
Watch 10TV News HD and refresh 10TV.com for continuing coverage.Previous Stories:
February 8, 2011:
Video, Photos Reveal More About Knox County Case
February 7, 2011: Knox County Killer: 'I Did Not Know A Single One Of Them'
January 6, 2011: Man Gets Life In Prison For Knox County Slayings, Rape
December 7, 2010: Accused Knox County Kidnapper Taken Off Suicide Watch
November 24, 2010: Fire At Home Of Slain Knox Co. Woman Ruled Arson
November 23, 2010: Fire Causes Minor Damage To Home Of Slain Knox Co. Woman
November 22, 2010 : Accused Knox County Kidnapper Waives Hearing
November 22, 2010: Knox Co. Community Reeling From 'Evil Personified'
November 20, 2010: Knox County Women, Boy Stabbed And Dismembered
November 19, 2010: Family, Community Mourns Knox County Tragedy
November 19, 2010: New Details Released On Discovery Of Bodies
November 19, 2010: Hundreds Join Vigil For Slain Women, Boy
November 18, 2010: Remains Of Women, 11-Year-Old, Found
November 18, 2010: Clothing Found During Knox County Search
November 17, 2010: Sheriff: Reality 3 Missing May Be Dead 'More Prevalent'
November 17, 2010: Knox Co. Search Enters Seventh Day
November 16, 2010: Suspected Kidnapper Bought Trash Bags, T-Shirt, Tarps
November 16, 2010: Families Still Hopeful 3 Will Be Found Alive
November 15, 2010: Mother Of Suspected Kidnapper Says He Is 'Loner'
November 15, 2010: Sheriff: 3 Missing People Could Be Dead
November 15, 2010: Police Block Off Park As Mount Vernon Search Continues
November 15, 2010: Suspected Kidnapper's Past Includes Arson Conviction
November 14, 2010: Missing Girl Found Safe; Man In Custody
November 13, 2010: Search For 4 Grows More Intense
November 13, 2010: Support Growing To Find Missing Family, Friend
November 12, 2010: Search Continues For Missing Women, Children
November 12, 2010: 4 Missing From Knox Co.; Discovery Of Pickup Prompts Kenyon College Lockdown