A 14-year-old boy allegedly told pals he wanted to drag a random person into the woods and kill them before carrying out his crimes.
Aiden Fucci is standing trial on suspicion of knifing a classmate cheerleader Tristyn Bailey, 114 times.
The 13-year-old girl's body had been dumped close to Fucci's home in St Johns, Florida, and found on May 9 earlier this year.
As the murder case continues, prosecutors brought out on Wednesday a series of evidence they claim links the defendant to the crime.
When told Bailey's body had been recovered, Fucci allegedly replied: "How is that my problem?"
A medical examiner's found the victim had suffered 35 stab wounds to her head and neck and a further 49 defensive stab wounds to her arms.
There was no evidence of sexual assault, MailOnline reports.
The word "karma" had been penned on Bailey's left ankle along with a smiley face on her right ankle but it is not clear if she drew those herself.
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According to a St Johns County Sheriff's Office report, a female friend of Fucci's told police that he had frequently spoken about killing people.
She said that in the weeks leading up to Bailey's death, Fucci disturbingly confessed that he wanted to murder someone by dragging them into the woods and stabbing them.
The friend also said Fucci would "take his knife out and pretend to stab her with it" and that he would "draw graphic pictures depicting mutilated bodies".
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They added that the accused would hear voices in his head that ordered him to kill people, according to the report.
Detectives found a notebook in Fucci's home that was filled with "violent" sketches of women, including one with red Xs on her breasts and severed arms as blood poured out.
A document detailed the moment his mum told him in a police interview room that Bailey's body had been found.
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According to the report, Fucci replied: "How is that my problem?"
Fucci's mother, Crystal Smith, also faces charges of evidence tampering after she allegedly threw her son's blood-stained jeans from his bedroom into the washed after he was arrested.
When detectives searched Fucci's bedroom, it is alleged that they found a Buck knife sheath, as well as shoes and a shirt with blood on them.
A Buck knife found in a pond near Bailey's body was consistent with the stab wounds the teenager suffered, according to police.
An examination of the jeans that Smith allegedly washed, still had traces of blood that were also found in a drain in the family's home.
Authorities added that his DNA was found all over Bailey's body.
Fucci's initial second-degree murder charge was upgraded to first-degree murder, meaning he will face trial as an adult.
From the back of a police car, Fucci posted a selfie on Snapchat with the caption: "Anyone seen Tristyn?"
The photo sparked outrage causing the St John's County Sheriff's Office to explain that Fucci had been taken in for questioning as a person of interest, which is why he was not in handcuffs and still had his phone.
State Attorney R.J. Larizza said during a press conference that the Snapchat post showed Fucci had no remorse for his actions.
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