The 19-year-old also faces 27 charges at the federal level, one of which carries a possible death sentence. He will make an appearance in federal court this week.
Before being flown to Buffalo, N.Y., Hamlin had been treated for nearly a week at the University of Cincinnati Medical Center after going into cardiac arrest on the field during Monday Night Football.
The city in western New York was among the hardest hit by snow and cold. At least 31 people in Erie County were killed because of the storm as of Tuesday evening, according to the health department.
The 19-year-old will be sentenced to life without parole for the state charges. He faces an additional 27 charges at the federal level, one of which carries a possible death sentence.
The May 14th Memorial Commission is a step in the state's long-term commitment to supporting and uplifting the East Side Buffalo community, officials say.
The New York attorney general's office said it reviewed thousands of pages of documents and social media content to study how the suspect used online platforms to plan and publicize the mass shooting.
In a statement to NPR, a spokesperson for the New York State Unified Court System said the defense has "neither filed a notice nor requested an extension to do so."