Judge Scott Needham ruled Tuesday there was enough probable cause that Aaron Schaffhausen committed a felony and set his arraignment for Aug. 28, when he will enter a plea, the Hudson (Wis.) Star-Observer reported.
Schaffhausen, 35, is charged with three counts of first-degree intentional homicide in the July 10 deaths of daughters Amara, 11, Sophie, 8, and Cecelia, 5, at their River Falls residence.
Prosecutors called a babysitter, the person who handled the emergency call from Schaffhausen's former wife, and a police officer who responded to the call, the Star-Observer said.
River Falls police officer John Wilson testified he found the children in separate bedrooms in the house.
Wilson said he observed the autopsies on the three girls at the Ramsey County, Minn., Medical Examiner's office in St. Paul, about 30 miles from River Falls. He said two of the girls had, "large gaping wounds across their necks," and one child had "two gaping wounds across her neck."
A murder weapon has not been identified, but prosecutors earlier indicated they thought it was a knife.
Soon after the bodies were discovered, Schaffhausen turned himself in to police. He has been held in the St. Croix County jail on $2 million cash bail since his arrest.
Court record indicated Aaron and Jessica Schaffhausen were divorced in January. Aaron Schaffhausen listed his address as Minot, N.D.