The Health Service Executive was warned that Daniel McAnaspie's behaviour could prove fatal six weeks before the teenager went missing.
Confidential assessments also state that the teenager, who was stabbed to death while in State care, was previously attacked when he was 13 and was lucky to survive.
His body was found in a drain in a field in Co Meath 12 days ago.
The documents, seen by RTÉ News, outline various educational, psychological, emotional and treatment needs assessments carried out on Daniel during his seven years in care.
They show that even though his problems had been identified at an early age and extensively reported on, they were not properly addressed.
The HSE was warned that 'unless significant innovation and support is provided to Daniel it is highly likely that self-deprecating behaviours will escalate to fatal levels'.
When he was 11 it was found that Daniel had a 'positive regard for school' but was 'well below average for his age'.
However, it was four more years before his dyslexia was identified as a 'possibility' and in a subsequent report he was still assessed as 'poorly educated'.
Another report in March 2009, when he was 16, found he had attempted suicide and had to be admitted to hospital for drug abuse.
Meanwhile, a teenage girl has been arrested by gardaí investigating the murder of Daniel McAnaspie.
She was arrested this afternoon and is being held at Blanchardstown Garda Station.
Three men who had been questioned about the death of the 17-year-old have been released and files are to be prepared for the Director of Public Prosecutions.
A fourth man is still being questioned.
