FORT LAUDERDALE, Fla. -

A jury is deliberating the fate of a South Florida teenager accused of savagely kicking and stomping 15-year-old Josie Lou Ratley outside Deerfield Beach Middle School in March of 2010.

The six-person jury went behind closed doors Monday morning following the five-day trial last week of 17-year-old Wayne Treacy.

The prosecution and the defense gave their closing arguments in the attempted murder trial Friday afternoon.

Treacy is accused of throwing Josie Lou Ratley to the ground, slamming her head against the concrete and kicking her in the head with steel-toed boots. She has permanent brain damage. Investigators said Treacy beat Ratley after she sent him a text message making light of his brother's recent suicide.

Neither disputed that Treacy beat Ratley, but they disputed why.

A prosecutor is asking jury members not to believe that Treacy was insane at the time of the attack. Treacy's attorneys have argued that the teen suffers from post-traumatic stress disorder after his brother's suicide a few months before the attack.

If convicted of attempted murder, Treacy faces a maximum sentence of 50 years in prison.