The court trial of a young father who was charged with murdering his 2-month-old baby after he bound a blanket so tightly that the infant couldn't breathe begins Tuesday morning in Scott County District Court.

Joshua S. Sundblad, 26, of Belle Plaine, is facing two counts of first-degree assault, first-degree murder, second-degree manslaughter and third-degree assault in the May 9, 2014 death of Carson Scott Bosquez Sundblad in the home of the mother's parents.

In an unusual move, defense attorneys waived a jury and the trial is set before Judge Chris Wilton.

According to the criminal complaint, the infant's mother told police she left work on a break and saw Sundblad in bed with Carson, and the baby appeared purple. She said they picked up Carson and he was limp and also unresponsive to other efforts to rouse the boy.

Carson was taken to a Minneapolis hospital and died nearly six hours later.

An autopsy by the Hennepin County medical examiner found many injuries, among them a fractured skull and bleeding on the brain that appeared to have happened some time ago, recent and not so recent rib fractures, and a broken wrist.

Under questioning in late July and early August of 2014, Sundblad cited accidents in explaining some of the injuries but could not explain the skull fractures. He said he either fell while holding Carson, held him too tightly while changing his son's diaper or accidentally banged the boy's head on a door frame.

Sunblad said he "was not in a good mood" on the day of Carson's death and placed the boy on the changing table "in a firm or aggressive way," the complaint read.

After changing Carson's diaper, he wrapped the crying baby "so tight that he could not breathe," the complaint continued. He said Carson stopped crying after about five minutes.

Twitter: @KarenAnelZamora