Chilling Testimony At BTK Hearing

(Editors note: Testimony detailing the murders is graphic and may be objectionable to some readers.)

During the

In describing one killing, Rader told Snyder: "I'm sorry. I know this is a human being, but I'm a monster."

CBS News 48 Hours correspondent Erin Moriarty reports that on the witness stand, there were toys Rader gave to three young children he locked in the bathroom while he strangled another victim, Shirley Vian.

Rader, a 60-year-old former church congregation president and Boy Scout leader, pleaded guilty in June to 10 murders between 1974 and 1991. The slayings terrorized the Wichita area until Rader was arrested in February.

The sentencing in many ways is a formality, with the only issue before the judge whether Rader will serve his 10 life sentences consecutively or concurrently. Kansas had no death penalty at the time the killings were committed.

Jeff Davis, a son of one of the victims, told Moriarty that he hopes Rader gets the maximum sentence: 175 years.

Rader's long fascination with bondage was shown to the court in a photo he apparently took of himself wearing pantyhose and a bra and hanging from a pipe in the basement of his mother's home.

Kansas Bureau of Investigation special agent Larry Thomas testified that after Rader killed Josephine Otero's parents and brother, he took the 11-year-old girl to the basement. Prosecutors projected to a screen Rader's recollection of the exchange he had with Josephine before he killed her.

"What's going to happen to me?" she asks.

Rader: "Well, honey, you're going to be in heaven with the rest of your family."

Rader then hanged the girl and masturbated over her body.

"I remember problems with Josephine because her hair was in the way," Rader told investigators.

Rader looked away briefly as crime scene photos were projected on the courtroom screen. But he otherwise appeared calm throughout the hearing, sipping water or occasionally taking notes on a legal pad.

Moriarty, who has spoken with Rader several times,

Moriarty reports that due to Rader's docile nature, his prosecutors call him the "gentleman serial killer." He's so ordinary and calm, Moriarty says, one must be reminded that he is an admitted serial killer. He speaks in a monotone, using the same matter-of-fact tone — whether he is talking about his work as a local dogcatcher or his method for killing people.

Moriarty reports what is most unnerving about Rader is his ability to hide his dark side from people he knows. He never gave any details of his killings away in 34 years of living in the community he killed in.

Rader said his wife often spoke of her fear of the BTK killer. He comforted her by suggesting that she "just keep the doors locked. I wasn't really worried," he told Moriarty, "since I knew I was the one doing the killing."

The hearing is expected to extend into Thursday, and feature statements from victims' relatives before Judge Gregory Waller imposes the sentence. Prosecutors want Rader to get the longest possible sentence — a minimum of 175 years without a chance of parole.

Wednesday's details were wrenching for the surviving Otero children, who found their parents dead when they came home from school in January 1974. They would learn later that their brother and sister were also dead.

Carmen Otero clutched an afghan in the courtroom and nervously tapped her foot on the floor through much of the testimony. She was just 13 when she used a fingernail clipper to try to cut the gag off her dead mother's face.

The two brothers, Charlie and Danny, mostly crossed their arms through the testimony, occasionally wiping away a tear. But when prosecutors projected a close-up photo of Josephine on the screen, Charlie Otero became visibly flushed, buried his face on his lap and cried.

"It was very rough. I had never seen pictures like that before and it broke my heart," Charlie Otero said.

Rader looked on as KBI special agent Raymond Lundin said the killer told authorities in an interview after his Feb. 25 arrest that he targeted Josephine because he was attracted to Hispanics.

"He said that he has always been attracted to Hispanic looking people — dark eyes, dark hair, dark skin. He said Josey was the one who caught his eye and she was his target," Lundin said.