PHARR, Texas (KAKE) – Police in southern Texas have arrested two brothers accused of beating their stepfather to death for allegedly sexually abusing their 9-year-old half-sister. 

Brothers Alexandro and Christian Trevino, along with family friend 18-year-old Juan Eduardo Melendez, are accused of beating 42-year-old Gabriel Quintanilla to death Thursday. A farmer found his body and called McAllen police. 

MyRGV reports Quintanilla had a warrant for continuous sexual abuse of a child, police say.

Pharr police say Quintanilla's daughter made an outcry at a local RV park.

“When brothers Alexandro and Christian Trevino found out, they became enraged and confronted Gabriel Quintanilla at the residence. A physical fight ensued between the three and the victim Quintanilla left location on foot,” Pharr police told MyRGV.

Investigators says Quintanilla was again beaten and suffered severe head trauma before being dropped off where the farmer found him. 

Alexandro is charged with aggravated assault and engaging in organized criminal activity. Christian and Melendez are charged with capital murder, aggravated assault and engaging in organized criminal activity.

Alexandro's bond was set at $1 million, Christian's was set at $1.5 million, and Melendez was held on $1.502 million bond.