Dwayne Moore, 33, was arrested today for the Sept. 28 murders  of three adults and one child on Woolson Street in Mattapan, Boston Police and the Suffolk County District Attorney's office announced.
Moore was charged with killing Levaughn Washum-Garrison, Simba Martin and Eyanna Flonory and her 2-year-old son Amanihotep Smith on Sept. 28.
Police and prosecutors said they could not comment further because a Suffolk County grand jury is currently investigating the crimes.
Dwayne Moore was convicted of manslaughter in 1996 for killing a Milton teen in a fight on Arborcrest Terrace in Mattapan the year before. He received a state prison sentence of 15 to 18 years after a jury found he had taken a knife away from somebody with whom he'd been feuding, then stabbed him the neck (more details , from a court ruling on his unsuccessful appeal of his sentence).
Moore is the second person arrested in connection with the Woolson Street murders. Last month, police arrested Kimani Washington  on charges of illegal possession of a firearm and receiving stolen property.