Reuben D. MillerLEXINGTON PARK, Md. — Reuben D. Miller, 57, of Lexington Park, faces criminal charges after allegedly assaulting a vulnerable adult diagnosed with autism and intellectual disabilities, according to court documents from the St. Mary’s County Sheriff’s Office. Deputies responded to the ARC of Southern Maryland in Lexington Park on April 21, 2025, after…