The 20 year old also shot dead his mother Nancy before taking his own life as police closed in on him at the Sandy Hook elementary school in Connecticut.
The massacre prompted President Obama to look into new gun controls and banning assault rifles such as AR-15 Bushmaster used by Lanza in his rampage.
The study of the killer’s DNA has been ordered by Connecticut Medical Examiner H. Wayne Carver who carried out the post mortems on all the victims.
He has contacted geneticists at University of Connecticut’s to conduct the study.
Read more: http://www.dailymail.co.uk/news/article-2253797/DNA-Sandy-Hook-killer-Adam-Lanza-examined-evil-gene-study-kind-conducted-mass-murderer.html#ixzz2GJl0e3gm