Updated:TAMPA, Fla. —
A Florida mother who shot her two teenage children in the head says she knows what she did -- but not why she did it.
Julie Schenecker apologized to "everyone in the courtroom" following her conviction Thursday on two counts of first-degree murder.
Crying as she spoke, Schenecker told the judge and jurors that she would have plenty of time in prison to "try to understand" why she killed her 13-year-old son, Beau, and 16-year-old daughter, Calyx.
The jury delivered its verdict within two hours, agreeing with the prosecution that the 53-year-old former military linguist knew exactly what she was doing when she aimed a .38-caliber handgun loaded with hollow-point bullets at her children's heads.
The defense argued Schenecker was legally insane.