A new book by a former lead investigator in the JonBenet Ramsey murder disputes the theory that an outside intruder was responsible for her death.

Former lead detective James Kolar just released his self-published book, "Foreign Faction: Who Really Kidnapped JonBenet?" about the unsolved murder of the six-year-old girl found murdered in her wealthy parent's home the day after Christmas in 1996. The book's title was inspired by the name signed on the ransom note, "a small foreign faction."

Kolar notes that cobwebs that remained intact stretched over the window through which the intruder allegedly entered disputes the "intruder theories." He also claims that abrasions on Ramsey's back may have come from a toy found at the scene and not a stun gun. Kolar had access to 60,000 pages of evidence, including crime-scene video and photos, interviews with individuals related to the case and forensic reports.

The Daily Beast obtained an exclusive video and a portion of a basement crime-scene video taken around midnight, just hours after JonBenet's body was found there by her father. The video shows a triangle of cob web intact. Kolar believes the intact web is evidence that no one entered the Ramseys' house from outside, reported The Daily Beast.

You can view the crime scene video here:

"By the time I parted company with the D.A.'s office, I was convinced that there was no significant possibility that an intruder had been involved in the death of JonBenet," Kolar writes in his book.

JonBenet Ramsey was found beaten and strangled on Dec. 26, 1996 in the basement of her family home. The ransom note asked for $118,000 in exchange for the safe return of JonBenet. The note was found hours before a search of the house turned up the dead girl.

Ramsey's parents were considered suspects for years and later cleared when local police found a DNA sample of an "unknown" male found in JonBenet's underwear and on her leggings.

"The match of male DNA on two separate items of clothing worn by the victim at the time of the murder makes it clear to us that an unknown male handled these items," District Attorney Mary Keenen Lacy wrote, according to Daily Beast.

Patsy Ramsey died in 2006 of ovarian cancer.

Ramsey family attorney Lin Wood said he had not read Kolar's book and declined to comment on the detective's theories.

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