CINCINNATI (WKRC) – A teen admitted his role in three fatal shootings in 2021, when he was just 15 years old. Michael Madaris, now 18, allegedly murdered 18-year-old Avante Beatty in Avondale. About a month later, police say he killed both 39-year-old Yarsellay Sammie, Sr. and 16-year-old Javier Randolph in…