At least three people, including a 2-year-old boy, remained hospitalized late Monday with critical injuries following a string of Memorial Day weekend accidents that killed 12 people on Minnesota roads.

The fatal accidents occurred Friday, Saturday and Sunday, Minnesota State Patrol spokesman Lt. Matt Langer said Monday evening, adding that based on reports at 8 p.m., Memorial Day itself was free of fatal crashes.

Rita Seha, 43, and Carter Newell, 2, both of Rochester, Minn., were critically injured late Saturday when the minivan they were in was broadsided in Olmsted County by a driver who had been drinking, Langer said. Four people in the van died.

St. Marys Hospital in Rochester said Seha remained in critical condition late Monday, but would not give out any information about Carter.

Meanwhile, John Hubers, 51, of Oak Grove, Minn., was in critical condition at North Memorial Medical Center in Robbinsdale. His wife, Judy Hubers, 59, was killed Saturday night in a crash on Hwy. 371 in Cass County. A car traveling north on Hwy. 371 braked to avoid hitting another vehicle, swerved into the southbound lane and crashed head-on into the Hubers' motorcycle.

In the Olmsted County fatal crash, Christopher S. Frisch, 25, of Winona, was arrested on suspicion of criminal vehicular operation. He was not injured. Frisch was drunk, Langer said.

The van was headed north on Hwy. 63 when it was hit by Frisch's car, which was traveling east on Hwy. 30. Killed were driver Terry Milholland, 45, of Beecher, Ill., and passengers Heidi Newell, 19, and Jarah Beers, 23, both of Rochester, and Raymond Milholland, age and hometown unknown.

Also killed this weekend:

•Patricia Diethelm, 61, of Carver, died of injuries suffered in a two-car crash Sunday in Carver.

•Jordan Murphy, 21, of Winona, died early Sunday when he lost control of his car on Hwy. 43 in Fillmore County and it rolled. He was not wearing a seat belt, and alcohol was detected on him.

•Amber Frandup, 25, of Eagan, died late Saturday when the motorcycle on which she was a passenger crashed into the back of a car on the Mendota Bridge in Dakota County.

•Jason Boeckel, 25, of Otsego, Minn., was hit and killed on Interstate 94 at County Road 75 in Wright County late Saturday.

•Levi Madison, 27, of Rochester, died Saturday afternoon when his vehicle crossed into oncoming traffic on Hwy. 14 in Olmsted County.

•Paige Brown, 17, of Cass Lake, Minn., died early Saturday in a car that ran off an Aitkin County road.

•Austin Shimon, 20, of Corcoran, died early Saturday at North Memorial Medical Center of injuries suffered in a crash Friday near Medina.

sziegler@startribune.com • 612-673-1707 pmiller@startribune.com • 612-673-4290