LESTER HOLT: There are new questions tonight into the death of a 13-year-old California teen, his youth soccer coach being charged with murder. L.A. District Attorney saying the death penalty is not off the table. Our Morgan Chesky has more. MORGAN CHESKY: Inside a Los Angeles courtroom, soccer coach Mario Edgardo Garcia Aquino will soon hear formal murder charges after being accused of killing one of his own players. Officials say the undocumented 43-year old is accused of killing 13-year-old Oscar Omar Hernandez. NATHAN HOCHMAN: The Hernandez family, you have our deepest sympathy. CHESKY: The D.A. stressing the death penalty remains an option as investigators piece together a disturbing timeline. Prosecutors allege Garcia Aquino killed Hernandez on March 28th after his family says the coach hired him to do housework. But Oscar never returned. By March 30th, family reported him missing. Authorities discovered the boy's body two days later, dumped in a neighboring county. Oscar's brother breaking down, sharing he didn't deserve this. Now the family is pressing authorities on why Garcia Aquino was still coaching after two other teams previously accused him of sexual assault. ESTUARDO REYES: You gotta be careful now. Whoever you go out with, even though you trust them, you never know. CHESKY: Reporter: Now as a memorial for the murdered teen grows, authorities urging other potential sexual assault victims to speak out. ROBERT LUNA: You may be here undocumented. We're not going to ask about that. Please. You need to come forward. CHESKY: And in addition to those murder charges for Garcia Aquino, late today the DA announcing they’re also adding charges for sexual assault against a minor, saying his new arraignment is set for April 30th. Lester. HOLT: Morgan Chesky, thanks.