A woman accused of killing a pregnant woman and cutting the baby from her womb told officers she briefly reconsidered taking the infant, but ultimately decided to go through with her plan, a police investigator testified. Prosecutors were expected to rest their case Friday in the trial of 39-year-old Lisa Montgomery, who is accused of killing Bobbie Jo Stinnett and taking her baby on Dec. 16, 2004. Montgomery has pleaded not guilty to kidnapping resulting in death. Her lawyers are pursuing an insanity defense. Sgt. Randy Strong, an investigator with the Maryville police department, was one of the first investigators to enter Montgomery's home in Melvern, Kan., on Dec. 17, 2004, where he found Montgomery sitting on the couch holding a baby.

Strong testified Thursday that Montgomery initially denied even knowing about Stinnett's death or that a baby was missing from Skidmore, Mo. But after being questioned at a police annex in Lyndon, Kan., Montgomery eventually looked at the floor and said, "You have Bobbie Jo's baby," Strong said.

Strong testified that Montgomery told officers that before killing Stinnett, she had reconsidered taking Stinnett's baby, but "something out of character for her happened" and she went ahead with the plan.

Prosecutors allege Montgomery was faking a pregnancy for months before she strangled Stinnett, 23, at Stinnett's home in Skidmore, cut out the baby girl and then passed off the infant as her own.

Montgomery took a concealed rope and knife with her into Stinnett's home and strangled Stinnett, who was eight months pregnant, before cutting into her womb and removing the baby with her hands, according to Strong and FBI Special Agent Scott Gentine, who also testified Thursday.

The two men said Montgomery drove away holding the baby's umbilical cord in her hands before eventually stopping to clamp it and to clean up the baby. After changing clothes, Montgomery called her husband and asked him to pick her up at a fast-food restaurant in Topeka, Kan., near a center where she said she had given birth.

Gentine said Montgomery occasionally sobbed while talking to him, but then composed herself and continued. "I don't know if she was remorseful or sorry that she got caught," he said.

The investigators testified after a computer forensics expert spent most of the day on the stand discussing his analysis of the contents of Montgomery's computer.

Mark Johnson said he found Internet searches about Caesarean sections, birth certificates and the medical facility where Montgomery later claimed to have given birth - all at the same time her ex-husband was threatening to expose her.

He said his examination uncovered e-mails in which Montgomery's ex-husband planned to use her lies about being pregnant to get custody of their children.

Johnson said he also found Web searches for information on Stinnett, as well as visits to sites where Stinnett had posted pictures of herself pregnant and ultrasound pictures of her baby.

Prosecutors have said they will seek the death penalty if Montgomery is convicted.

Besides convicting or acquitting her, jurors could find Montgomery not guilty by reason of insanity. If that is the verdict, she would undergo a mental evaluation and a judge would decide if she will be released or committed to a mental institution.