There has been at least one sign that discord may have seeped into the jury room.
The panel has been considering the case against Alexander Alfaro since Thursday afternoon after sitting through a four-week trial.
Alfaro, 16 at the time of the murders, faces 17 counts including murder, robbery, felony murder and weapons offenses.
On Monday morning, jurors requested a re-reading of testimony by Nancy Ramirez, a cousin of Alfaro's who testified she spoke to him on the day after the incident. After lunch, the panel deliberated straight through until 5:30 p.m. without reaching consensus.
Late in the afternoon, however, brief shouting could be heard coming from the jury room, though it was not clear what was being said.
Deliberations were to resume Tuesday morning.