Police were at the scene of the murder Monday morning and are actively looking for leads and witnesses.
There is a memorial at the sight of Rojas' death. Friends have left candles, balloons and bottles. She was found next to some railroad tracks behind several apartment complexes on Phoenix Drive.
The death left the teen's family devastated.
"I am going to keep waiting for the rest of my life to see her [walk] through that door. And it is never going to happen," said Cuco Rojas, the teen's father.
Naomy's family says she was not involved in gangs and was a good student. But they say she had begun to hang out with the wrong crowd. They are still perplexed why anyone would want to kill her.
She was found by police around 4:15 a.m. Saturday morning. Law enforcement officials say they are working hard on the case, but they can't do it without cooperation.
"We believe that there were other people present and we're asking for those people to please come forward and contact the police department; provide us with information," said Lt. Stephen Crane of the Fairfield Police Department.
Fairfield Police Department Major Crimes Unit at (707) 428-7600, the 24-hour Tip Line at (707) 428-7345 or Crime Stoppers at (707) 644-7867. Callers can remain anonymous.