Kimani Washington admitted he was part of a plan to rob the victims of drugs and money.
Two men accused of killing four people — including a toddler — in 2010 are heading to trial on murder charges Monday.
A third man arrested in the September shooting deaths of four people in Mattapan, was ordered held without bail Thursday.
The Dorchester man wanted for questioning in the Mattapan murders won’t fight a return to Boston.
As police search for whoever is responsible for the Mattapan Massacre, more people stop by the growing makshift memorials to remember those who were gunned down.