WOOD-TV is reporting the Michigan Court of Appeals has denied an appeal by Sean Phillips for his conviction of unlawful imprisonment.
The charge comes in connection to the disappearance of his daughter, Katherine, or "Baby Kate" as she became known throughout coverage of the case.
Phillips is currently serving 10-15 years in prison for the unlawful imprisonment charge.
He has also been charged with murder in his daughter's death.
He was not charged with the open murder charge until after his conviction for unlawful imprisonment.
Phillips is scheduled to appear in a Mason County court for a preliminary hearing on Jan. 9 for that charge.
Four-month-old "Baby Kate" disappeared on June 29, 2011 while in the care of her father, Sean. Her remains have never been found.
A letter, apparently written by Sean Phillips in prison
, details what happened the day Baby Kate disappeared.
Mason County Prosecuting Attorney Paul Spaniola said that the letter was given to investigative officers by a family member of Baby Kate.
In the letter, Phillips said he had put his daughter in a peaceful place.
The letter will be used as evidence in the murder trial.