Convicted mass killer Eligio Adriatico is back before the courts as judges reconsider whether his life-without-parole sentences should stand. 

Adriatico, who along with an accomplice killed nine people in 1983 and later murdered two inmates at DOC, was in his early 20s at the time of the crimes. The Guam Supreme Court ruled last year that mandatory life terms for youthful offenders may violate the island’s constitutional protections under “evolving standards of decency.”

Now, Superior Court Judge Vernon Perez has set a November 21 status hearing as both defense and prosecution race to line up brain science experts, cultural historians, and institutional records. The case could determine whether Adriatico’s sentences are reduced—more than 40 years after one of Guam’s deadliest crime sprees.