EDTA is FDA approved for pediatric use. It's highly unlikely the boy died from EDTA if they were watching his creatinine.
SIDE EFFECTS
The following adverse effects have been associated with the use of edetate calcium disodium:
Body as a Whole: pain at intramuscular injection site, fever, chills, malaise, fatigue, myalgia, arthralgia.
Cardiovascular: hypotension, cardiac rhythm irregularities.
Renal: acute necrosis of proximal tubules (which may result in fatal nephrosis), infrequent changes in distal tubules and glomeruli.
Urinary: glycosuria, proteinuria, microscopic hematuria and large epithelial cells in urinary sediment.
Nervous System: tremors, headache, numbness, tingling.
Gastrointestinal: cheilosis, nausea, vomiting, anorexia, excessive thirst.
Hepatic: mild increases in SGOT and SGPT are common, and return to normal within 48 hours after cessation of therapy.
http://www.rxlist.com/cgi/generic2/canaversenate_ad.htm
Just because it's approved for pediatric use, doesn't mean it isn't potentially deadly.
It is approved for chelation therapy for heavy metals but not for autism.
"Authorities said Kerry's office reported that the child was receiving an IV treatment for lead poisoning when he went into cardiac arrest.
The boy was being treated with EDTA, or ethylene diamine tetraacetic acid, which has been approved by the Food and Drug Administration for use only after blood tests confirm acute heavy-metal poisoning."
http://www.freerepublic.com/focus/f-news/1470332/posts