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Man accused of fatally stabbing teen and wounding 4 adults who were tubing down Wisconsin river

The St. Croix County sheriff said motive was unknown in the attack on a group floating the Apple River at the same time as the suspect.
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A 17-year-old boy was killed and four other people were wounded when a man stabbed them Saturday as the group was tubing down the Apple River, a Wisconsin sheriff said.

The 52-year-old suspect is from nearby Minnesota, as was the victim who died, St. Croix County Sheriff Scott Knudson told reporters, including NBC affiliate KARE of Minneapolis, at a news conference Saturday. Neither was identified Saturday.

The four survivors were described only as one woman and three men, all in their 20s. At least three of the victims were hospitalized in critical condition, while a fourth was described as "walking wounded," Knudson said.

Investigators haven't pinpointed motive for the attack. Knudson said the suspect and victims were in different groups of people simultaneously tubing down the river when incident happened around 3:45 p.m. Saturday in Somerset, Wisconsin.

"Everybody was tubing," the sheriff said.

The suspect in custody had left after the stabbing but was tracked down with the help of onlookers, including one who took a photo of the suspect and another who spotted him an hour and a half after the incident, the sheriff said.

The suspect was in St. Croix County Jail awaiting possible charges, Knudson said.

The suspect was not known to the sheriff's department, and Knudson said such an attack was rare for the area.

"It's been a number of years since a stabbing took place," he said, "maybe 15 years now."

CORRECTION (July 31, 2022, 8:54 p.m. ET): A previous version of this article misstated where the stabbing occurred. It was in St. Croix County, not La Croix County. It also misspelled the sheriff’s name. He is Scott Knudson, not Knudsen.