Authorities in Colorado are expected to release an affidavit shedding some light on the suspected motive behind the brutal murder of a pregnant mother and her two young daughters earlier this month.

As CrimeOnline previously reported, 33-year-old Chris Watts is accused of killing his wife, 34-year-old Shanann, and their girls, 3-year-old Celeste and 4-year-old Bella, before dumping their bodies at his former workplace. An examination of the victims revealed strangulation might have been a cause of death.

Investigators had not announced a suspected motive in the crime, which the suspect reportedly confessed that he committed. When additional court documents are released on Monday, they are expected to include details in coordination with the formal announcement of charges against him.

Early reports hinted at financial issues the couple had been dealing with, though no evidence presented to the public suggests this was a factor in the killings.

A party planned for Saturday would have allowed friends and family to celebrate the announcement of their third child’s gender, according to friends who say she was expecting a boy to be named Niko.

CBS News spoke to a former FBI profiler who said the suspect appears to demonstrate character traits like arrogance and apathy.

“When somebody kills their own family and then they go on TV to say, ‘But I didn’t have anything to do with it,’ that ability to be so very sure of your own interpersonal sills that you can attempt to fool a national and international audience is very unusual,” said Marry Ellen O’Toole. “There’s a lot of arrogance and confidence that you could pull this off, and that’s not typical.”

Forensic profiler Dale Yeager studied Chris Watts’ public statements after his family’s disappearance, too, as reported by CrimeOnline.

“He’s Scott Peterson, just less charismatic,” Yeager said, referencing the man convicted of his pregnant wife’s murder more than 15 years ago.

[Featured image: Chris Watts, Weld County Sheriff’s Office]