Update: Victim identified: Frederick Hines, 39, of South Boston.
State Police report a man on a 2016 Harley-Davidson Electra Glide "went off the roadway, struck the raised curb, entered the grass median and struck a tree" on a curve at Columbia Road and Babe Ruth Park Drive around 2:40 a.m.
He was taken to Tufts Medical Center, where he was declared dead.