Jurors in the Mattapan massacre trial deliberated for a second full day Wednesday without arriving at a verdict.

The jury, which first got the case last week, had to restart its deliberations when Suffolk Superior Court Judge Jeffrey Locke dismissed a juror Monday and replaced him with an alternate. The ousted juror had violated instructions against doing outside research on issues pertinent to the trial.

The jurors received some legal instructions this morning from the judge as they continued to deliberate over whether prosecutors have proven that Dwayne Moore murdered four people in 2010 in Woolson Street and wounded a fifth person, leaving him paralyzed.

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On Tuesday afternoon, the jurors had sent Locke a question asking for his clarification of a legal issue and the charges against Moore, who is on trial for the second time in the killings.

Moore has pleaded not guilty to all charges, and defense attorney John Amabile has told jurors that his client was wrongly accused.

The jury in Moore’s first trial, earlier this year, acquitted Moore’s codefendant, Edward Washington, but could not reach a unanimous verdict on the charges against Moore.

Moore is accused of killing 21-year-old Simba Martin; Martin’s girlfriend, Eyanna Flonory, 21; her 2-year-old son, Amanihotep Smith; and Levaughn Washum-Garrison, 22, Martin’s friend, who had slept on a couch at Martin’s Sutton Street house on Sept. 28, 2010. Marcus Hurd was shot in the head but survived.

The jurors are expected to resume deliberations.