The father accused of killing his three young daughters at the girls' River Falls, Wis. home did not meet the court's Friday deadline for a not guilty by reason of insanity plea.
Aaron Schaffhausen will make his next court appearance in January.
The 35-year-old carpenter from Minot, N.D. is accused of killing 5-year-old Cecilia, 8-year-old Sophie and 11-year-old Amara Schaffhausen at their home in River Falls last July during a visit with his daughters.
Schaffhausen's public defender, John Kucinski, had argued they should be able to plead not guilty by insanity at any point during the trial. But a St. Croix County judge set the Dec. 14 deadline, saying a flexible insanity plea date would add too many complications to an already complex case.
The judge wanted to ensure the trial begins on April 1