The judge, after questioning the jury about whether there was a possibility of reaching a verdict, thanked the jury members and sent them home.
Watson remained in custody.
A status hearing has been scheduled for Dec. 2, at which point more will be known about the future of this case.
For now, the attorneys and witnesses remained under a gag order, meaning they cannot talk about the trial.
The jury began deliberating Friday, Nov. 18, and broke for the weekend.
David Watson is facing charges in connection with the death of his ex-wife Linda Watson, his former mother-in-law Marilyn Cox and Cox's friend Renee Farnsworth.
Watson, who pleaded not guilty last year, is charged with two counts of first-degree murder and one count of second-degree murder. First-degree murder is punishable by death or life imprisonment while a second-degree murder conviction can result in a prison term of 10-25 years.
The jury has options in handing down their verdict. It can find Watson guilty or not guilty on all, some or none of the charges. For the second-degree murder charge, the jury has the option of finding Watson guilty of the lesser charge of manslaughter.