Lindsay Clancy returned to court on Tuesday in Plymouth, Massachusetts. Her lawyers used the appearance to challenge her case.

They want to stop a retrial. The case involves the 2023 deaths of her three children.

They argued the mistrial should not have been declared. They said retrying her would violate double jeopardy protections.

They also asked Judge William Sullivan to find her not guilty. They said Massachusetts had not proven she killed her children.

Prosecutors called the claim "laughable" and said evidence supported a conviction. The jury had deadlocked 11 to 1 in favor of acquittal.

This led the judge to declare a mistrial on September 4. The judge had not ruled on the acquittal request.

No trial date has been set. Clancy's lawyers also argued the judge should have checked a holdout juror's conduct.

At trial the defense did not dispute that Clancy killed her children. Instead they argued mental illness meant she was not criminally responsible.