FORT WORTH (July 14, 2012)—A Tarrant County jury has sentenced Pedro Dominguez, 19, to 99 years in prison for crashing a high school Halloween costume party and robbing the party-goers at gunpoint.

The jury deliberated for about 1½ hours Friday before deciding on the maximum sentence for Dominguez.

A statement from the Tarrant County District Attorney's Office says the sentence came a day after jurors deliberated about an hour before finding Dominguez guilty of 11 counts of aggravated robbery and one of burglary.

Four others were also accused in the attack on the house in Pantego.

A 15-year-old boy, who was 14 at the time, was sentenced last August to 10 years in a state juvenile facility.

Three others are awaiting trial.

Most of those attending the party were Arlington High School students.