Janet Marie Kartheiser told police that her actions were "unforgivable," that she knew she shouldn't have left the infant on his stomach after he rolled over in a crib.
That decision by Kartheiser, then an Apple Valley home day care provider, led to the death of 3½-month-old Lucas Scott Foster in July 2014, according to second-degree manslaughter charges filed Friday in Dakota County.
Manslaughter charges were also filed Friday against Paul Richard Sandell, 46, of Hastings, in the April 2014 death of 3-month-old Gabriel John Tseplaev.
Altogether, six infants have died in Dakota County while in the care of a day care provider, a family friend or a relative since 2011. Three of those manslaughter cases involved a child care provider, and three others occurred when a family member or a friend fell asleep in the same bed with an infant, according to charges.
"These are extremely tragic incidents, and in almost every case they're preventable," Dakota County Attorney James Backstrom said. "Not by any stretch are we calling [the deaths] intentional, but they involve negligence."
Kartheiser and Sandell are each scheduled to appear in Dakota County District Court on May 4. Kartheiser, 63, is also charged with interfering with the scene of the death, a gross misdemeanor, for allegedly hiding evidence at her home day care.
Neither Kartheiser nor Sandell could be reached for comment Friday.
Kartheiser is the mother of actor Vincent Kartheiser of the AMC television series "Mad Men."