FORT LAUDERDALE, Fla. (AP) - Closing arguments are beginning in the attempted murder trial of Florida teenager Wayne Treacy, who's claiming insanity in a 2010 kicking and stomping attack on a 15-year-old girl.

Prosecutors decided against calling any further witnesses Friday, and Treacy himself said he didn't wish to testify. Jurors could begin deliberations later Friday or Monday.

Defense experts testified that Treacy's assault on Josie Lou Ratley because of post-traumatic stress disorder triggered by his brother's suicide. Prosecution experts say Treacy knew right from wrong.

The attack outside a middle school came after Ratley made reference to the brother's death in a series of vulgar and insulting text messages between the two. Ratley nearly died and has permanent brain injuries.

Treacy faces a maximum 50-year prison sentence if convicted of attempted first-degree murder.