Anthony Admitted to 'Biggest Mistake' in 2008 She should have called cops right away, she said in interview By Evann Gastaldo, Newser Staff Posted Jun 2, 2011 12:07 PM CDT 2 comments Comments Casey Anthony cries as she listens to her brother Lee Anthony testify during her first degree murder trial at the Orange County Courthouse on Wednesday, June 1, 2011. (AP Photo/Joe Burbank, Pool) (Newser) – The Casey Anthony trial is in its eighth day, and jurors today listened to an hour-long conversation between the murder suspect and detectives who were accusing her of lying. Lead investigator Yuri Melich warned Anthony that if she didn't tell the truth about what happened to daughter Caylee, she would come off as a "cold-blooded, callous monster," and promised that detectives would find out what happened to Caylee. Anthony continued to insist during the interview that she left Caylee with a nanny, but admitted lying about other things and acknowledged at the end of the interview that her "biggest mistake was not calling you guys in the first place" and that she had been "beating myself up about this. Every single day." Melich testified today, as well as Jeff Hopkins, an acquaintance of Anthony's. Anthony claimed to have known Caylee's nanny through Hopkins, but he denied today knowing any such person, the Orlando Sentinel reports. Click to catch up on the trial.