Man arrested in fatal attack on 15-year-old Alyssa Otremba in Las Vegas

(CBS/AP) LAS VEGAS - Teenager Javier Righetti is behind bars on charges of murder after the body of 15-year-old Alyssa Otremba was found burned in the northwestern Las Vegas Valley.

Las Vegas police say Righetti, 19, was arrested less than a mile from where the body of Otremba was found Saturday in a vacant lot.

Police believe the murder was random. They say Otremba's body showed signs of blunt force trauma and multiple stab wounds.

" The body was burned. It appears that there was blunt force trauma as well as multiple stab wounds," Lt. Lew Roberts said, reports the Las Vegas Sun.  "It was a very horrific incident."

Oremba was reported missing Friday night after sending her mother a text message saying her cell phone was dying and she was walking home.

She never returned home.

Police said they received tips that led them to Righetti, who has had other run-ins with law enforcement. Righetti is set for a court hearing Wednesday on charges which include murder, sexual assault, kidnapping and robbery.