The Suffolk County Grand Jury today returned indictments charging three men with a total of 23 offenses stemming from the shooting deaths of two men, a young woman, and her infant son on Woolson Street last fall, Suffolk County District Attorney Daniel F. Conley said.

The indictments charge:

1. DWAYNE MOORE (D.O.B. 6/25/77) of Mattapan with four counts of first-degree murder and single counts of aggravated assault and battery with a dangerous weapon, armed assault with intent to murder, armed home invasion, armed robbery, trafficking in more than 28 grams of a Class B substance, and unlawful possession of a firearm as a Level III armed career criminal;
2. EDWARD WASHINGTON (D.O.B. 3/28/79) of Dorchester with four counts of first-degree murder and single counts of aggravated assault and battery with a dangerous weapon, armed assault with intent to murder, armed home invasion, armed robbery, and unlawful possession of a firearm as a Level III armed career criminal; and
3. KIMANI WASHINGTON (D.O.B. 10/17/75) of Dorchester with armed carjacking, armed home invasion, armed robbery, possession of a Class D substance with intent to distribute, trafficking in more than 28 grams of a Class B substance, and unlawful possession of a firearm as a Level III armed career criminal.

“These indictments reflect a herculean effort by Boston Police homicide detectives and Suffolk prosecutors who would not rest until the truth of these horrible crimes was known,” Conley said. “Our goal now is to prove the charges in court beyond a reasonable doubt and find justice for the friends, families, and community the victims left behind.”

The charges arise out of the Sept. 28, 2010, shooting deaths of Eyanna Flonory, 21, of Dorchester; her 2-year-old son, Amanihotep Smith; Simba Martin, 21, of Dorchester; and LeVaughn Washum-Garrison, 22, of Roslindale. Also shot in the same incident was a 32-year-old Dorchester man, who was grievously wounded but has thus far survived his injuries.

Shortly after 1:10 a.m., Boston Police responded to an activation of the city’s ShotSpotter system in the area of 40 Woolson St. and found the five victims suffering from gunshot wounds. Flonory, Martin, and Washum-Garrison were pronounced dead at the scene. Smith and surviving victim were rushed to area hospitals, where the infant was pronounced dead of his injuries as well.

As a result of the relentless investigation that unfolded in the days and weeks that followed, investigators obtained arrest warrants for Kimani Washington on Oct. 1, Dwayne Moore on Nov. 23, and Edward Washington on Dec. 8. In addition to praising the homicide detectives and prosecutors assigned to the case for those arrests, Conley hailed Boston Police criminalists assigned to the Ballistics, Crime Scene Response, and Latent Print units who lent their scientific expertise to the investigation; the detectives and uniformed officers of districts B-2 and B-3; the U.S. Marshal’s Service; and the prosecutors, paralegals, civilian investigators, and victim advocates assigned to the DA’s Homicide Unit and Dorchester District Court staff.

Kimani Washington is represented by attorney John Salsberg. He is held on $500,000 cash bail and expected to be arraigned in Suffolk Superior Court on Tuesday. Dwayne Moore and Edward Washington are both held without bail and represented by attorneys John Amabile and John Cunha. They are expected to be arraigned on separate dates in the near future.