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One of the two teen brothers charged with murdering another teenage boy in their Tacoma home last week will be arraigned on charges Monday.

Cristobal Arroyo, 14, faces first degree murder charges, but it's not yet known whether he will be charged as an adult.

His brother, Luis Arroyo, 16, will be charged as an adult with first degree murder and robbery in the death of Hector Hernandez-Valdez, 15, Pierce County Prosecutor Mark Lindquist decided.

According to prosecutors, Luis and Cristobal killed Hernandez-Valdez together, stabbing him, attempting to drain his body of blood, and slitting his throat before trying to dispose of the body in a recycling bin. Detectives said a knife blade broke off in the victim's dead and that he was stabbed more than 30 times.

Hernandez-Valdez and Luis Arroyo apparently got in a fight over marijuana and cash, when police said Cristobal joined the melee.

When the suspects' mother arrived at their home, she found stains in the kitchen that the boys claimed was spilled chili. Upstairs, police said she found the body of Hernandez-Valdez in a sheet.

She drove to the police station for help, and during that time police said the boys tried to dump the body in a recycling bin behind the house.

This is a horrible, adult-sized crime, and it's appropriate and just that the older brother be prosecuted and held accountable in the adult system, said Prosecutor Mark Lindquist.

Information compiled by KING 5's Lindsay Chamberlain

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