RIVER FALLS, WI (WTAQ) - Aaron Schaffhausen is due back in court Monday morning.

He’s the man accused of killing his three young daughters in July, at the home where his ex-wife was living in River Falls.

A judge has given the 35-year-old Schaffhausen until December 14th to decide whether he’ll plead insanity to the slayings. And he has until the end of the month to decide whether to seek a jury from outside the local area for a possible month-long trial that’s scheduled next April.

Prosecutors are awaiting a judge’s ruling on whether some of the state’s evidence can be sealed for now. The state says Schaffhausen could use some of that evidence to try and harm his ex-wife Jessica.

Lenders have filed a foreclosure suit on the home where the slayings occurred. They said Schaffhausen has only made one payment on a mortgage he took out in March – two months after he was divorced, and four months before the murders.

His family recently listed the home with a real estate agency – but the listing was canceled after Jessica pleaded not to sell the house. She feared that ex-husband would benefit from a sale.