Nicole Lee Kirtley, 34, invoked her right to remain silent when interviewed by a detective, but a short time later told an inmate that she had killed someone and didn’t feel bad about it, according to court documents released Monday.

Kirtley is charged with second-degree murder and grand theft, accused of shooting George Richardson Jr. on Thursday at his rural Nampa home and then stealing Richardson’s Jeep. She is being held in the Canyon County jail on $5 million bond.

According to a probable cause affidavit, Richardson left a Nampa bar with a woman about 1 a.m. Thursday, and witnesses picked Kirtley out of a photo lineup. A surveillance video showed Kirtley taking Richardson’s keys out of his hand and driving Richardson away from the bar in his Jeep, investigators said.

The affidavit includes information that may end up as part of Kirtley’s defense: When Kirtley was at the sheriff’s office for questioning, she struck up a conversation with a male inmate and told him that “she had been questioned about committing a homicide and she in fact did it, and she wasn’t going to be raped again. Furthermore, she did not feel bad about killing the person,” Canyon County sheriff’s Detective Christina Garrison said in the affidavit.

A witness told investigators that a woman matching Kirtley’s description drove away from Richardson’s house in the 1900 block of South Powerline Road about 7:30 or 7:45 a.m. Thursday in Richardson’s red and black Jeep Wrangler. Richardson was found dead from multiple gunshot wounds inside his home that afternoon.

The Jeep was found partially submerged in the Snake River about two miles from Kirtley’s home, with a rock on the gas pedal, according to the affidavit.

Sheriff’s investigators arrested Kirtley on Sunday on a charge of first-degree murder, but prosecutors amended the charge to second-degree murder, which involves malice aforethought but not premeditation.

Kirtley was in the county jail at the time of her arrest. She was given a suspended sentence on an unrelated burglary charge Friday and remanded to mental health court, but during that hearing she was arrested on an outstanding Ada County DUI warrant and taken to jail.

Her criminal record in the past six years includes a felony charge of obtaining a controlled substance by deception, two misdemeanor DUIs and a misdemeanor theft charge.

Kristin Rodine: 377-6447