Tristyn, 13, was stabbed 114 times and had 49 defensive wounds on her hands and arms
The medical examiner found the tip of Aiden s knife in her scalp - the rest of the knife was found in a pond
Fucci was taken into custody on second degree juvenile charges on May 10
He is accused of stabbing Tristyn a horrific number of times then leaving her body in the woods on May 9
Prosecutors have spent the last few weeks mulling over whether to upgrade those charges
They decided to on Thursday - now he s charged with first degree murder as an adult and faces life without parole