BARABOO, Wis. -- The father of 5-week-old twins found dead in his home has been accused of killing them.

A criminal complaint filed Wednesday in Sauk County Circuit Court charges David R. Yates, 45, of Baraboo, with two counts of first-degree intentional homicide in the deaths of twins Savannah and Tyler Yates.

The complaint said the babies suffered brain and other head injuries. The complaint said both died as a result of "non-accidental multiple acute blunt force traumas."

The twins' mother doesn't live with Yates and said that she left the babies with him only when she had to work.

The complaint said the babies were found dead at their father's home Sunday after police were called by the twins' mother because she had gone to the home to pick up the children and no one responded. The babies had been at the home since Friday.

The complaint said officers entered the home, found Yates in bed and then found the babies dead underneath it.

Yates' attorney said that his client takes "behavioral medication" and without it, might not be competent to deal with the legal system. Lawyer Paul Polacek said that he's not confident Yates will be able to make the right decisions. Yates was being held in the Sauk County Jail on a probation hold.

Sauk County authorities said they are continuing to investigate the deaths.

The infants were the second set of the mother's twins to die in infancy. The mother said that twins born to her 14 weeks early in the late 1990s died of natural causes after only a few days.