A 13-year-old Florida boy accused of fatally stabbing his mother as she was sleeping has been charged as an adult with first-degree murder.

Derek Rosa, 13, allegedly killed his mother Oct. 12 in their Hialeah apartment in front of her newborn baby, authorities said. Rosa was charged with first-degree murder by a Miami-Dade grand jury, which places his case in the adult felony court system, NBC Miami reported.
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Rosa’s first court proceeding was at a bond hearing Friday, when he was ordered to be held on no bond and remanded to the Miami Dade Juvenile Detention Center, online court records show.
At the hearing, Rosa’s father and grandmother testified on his behalf hoping the judge would release him on house arrest.
Hialeah police said that the deadly incident unfolded around 11:30 p.m. Oct. 12 and that officers responded after they got a call from the teen saying he’d murdered his mother, NBC Miami reported. Officers found his mother, 39, dead in her bedroom next to a crib where a 14-day-old baby was found unharmed.
Audio of the 911 call to police, obtained by NBC News, revealed that he took photos of his mother’s body and sent them to a friend on social media.
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In the audio, which was redacted, Rosa is heard asking dispatch to send police to his home but saying he does not know the address.
His voice is noticeably shaky in his responses. Dispatch is heard asking, “I need to know if your mom is breathing,” to which he responded, “Ma’am, she’s dead,” adding there’s “blood all over the floor.”
He said his newborn sister was sleeping in her crib. Asked whether he harmed her, he replied: “I did not touch her. I didn’t want to touch my sister.”
Rosa said his stepfather has two guns, one he took with him out of the house and one left in the home. The teen said he wanted to kill himself and loaded the gun but couldn’t and left it on the sofa.