Casey Anthony trial to start in Orlando, Fla.

By KYLE HIGHTOWER | May 24, 2011 | 8:00 AM EDT

ORLANDO, Fla. (AP) — A Florida mother charged with her toddler's death will have her day in court almost three years after her 2-year-old daughter disappeared.

Opening statements are set for Tuesday in the first-degree murder trial of Casey Anthony.

No witnesses saw what happened to 2-year-old Caylee Anthony, and only her killer knows exactly how she died. So the jury's decision will likely come down to forensic evidence.

If convicted, 25-year-old Casey Anthony could be sentenced to death. She has pleaded not guilty and says a babysitter kidnapped Caylee.

The trial is expected to last from six to eight weeks. Jurors were picked from Pinellas County on the Gulf Coast and transported to Orlando where they are being sequestered during the trial.