Mom of missing baby Lisa Irwin claims she was drunk when infant vanished

(CBS/KCTV/AP) KANSAS CITY, Mo. - Deborah Bradley, the mother of missing Kansas City baby Lisa Irwin, admitted that on the night of her child's disappearance she was drunk, and said she expects to be arrested.

Pictures: Missing Kansas City infant

Bradley told NBC's "Today Show" Monday that the night Lisa disappeared she had bought wine and consumed "enough to be drunk."

A surveillance video was uncovered during the search for the baby, showing Bradley at a local market purchasing boxed wine as well as baby supplies shortly before 5 p.m. on the night Lisa went missing, reports CBS affiliate KCTV.

Private investigator Bill Stanton, who is working with the couple to help find Lisa, says Bradley did have two or three drinks that night. He also thinks that she may have misspoken when talking to the national news reporter. 

"Your version of drunk maybe different than Deborah's version of drunk," said Bill Stanton.

Bradley says police asked her if she killed Lisa, who was 10 months old when she disappeared Oct. 4. She says she doesn't "think alcohol changes a person enough to do something like that."

She says she fears being arrested because then the search for Lisa will end and she will "never know what happened."

Hundreds of state and federal law enforcement officers have been involved in the search for Lisa, but have turned up no evidence pointing to her whereabouts.

On Friday, a $100,000 reward was offered by an anonymous donor for the child's safe return or information leading to a conviction of anyone involved in her disappearance.

Anybody with information in her disappearance is asked to call the TIPS Hotline at (816) 474-TIPS.

Complete coverage of Lisa Irwin on Crimesider