Teens Who Ruined Many Lives.

The Jacksonville Sheriff's Office interrogation of then-12-year-old Cristian Fernandez, who pleaded guilty this month to manslaughter and aggravated battery in the death of his 2-year-old half brother, was released to Channel 4 on Monday.

The interview and confession recorded by detectives were ultimately thrown out by a judge after she ruled the boy hadn't fully understood his Miranda rights or what he was doing when he waived them. Fernandez was arrested and interrogated in March 2011. He was charged with murder and became Duval County's youngest-ever murder suspect.

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