The last of three men connected by prosecutors to September's quadruple murder in Mattapan pleaded not guilty Wednesday.
Edward Washington was arraigned in Suffolk Superior Court on four counts of first-degree murder, armed assault with intent to murder and other offenses. He is held without bail.
Suffolk County Assistant District Attorney Edmond Zabin says Washington was not the mastermind behind the attack, but was responsible for the murders.
"This defendant and Dwayne Moore marched the people who were inside and marched them up the street to Woolson Street and somewhere around the corner of Woolson and Wildwood Street those individuals were all shot," Zabin said.
The 31-year-old Washington is one of three men accused of playing a role in the Sept. 28 shootings in Mattapan that resulted in the deaths of four people, including a 2-year-old boy, and left a fifth victim paralyzed below the shoulders.
Prosecutors say the five were shot during the robbery of a drug dealer.
Washington's lawyer, John Cunha, said he had nothing to do with the slayings.
"I'd like to make it absolutely clear that Mr. Washington adamantly asserts his innocence in this matter," Cunha said.
WBUR's Bianca Vazquez Toness contributed reporting.
This program aired on January 19, 2011. The audio for this program is not available.