Published: Feb 02, 2011 8:06 PM EST
Updated: Feb 02, 2011 5:06 PM EST

JACKSONVILLE, Fla. (AP) - A north Florida woman has been sentenced to 50 years in prison for shaking her baby to death after the boy's crying interrupted her game on Facebook.

A Duval County judge sentenced 22-year-old Alexandra Tobias on Tuesday. She pleaded guilty in October to second-degree murder.

Tobias previously told investigators that she was angered because the boy was crying while she was playing the game FarmVille.

She said she shook the boy, smoked a cigarette to compose herself and then shook him again.