A 17-year-old boy from Stillwater was killed, while three other men and one woman were hurt Saturday in a stabbing on a western Wisconsin river.
The suspect is a 52-year-old man from Prior Lake, who was arrested not far from the scene on the Apple River near Somerset.
He's expected to be charged on Monday and is being held in the St. Croix County jail in Hudson.
St. Croix County sherrif Scott Knudson says they are taking with multiple people who may know what happened.
"We're probably talking about 15 to 20 people that we're trying to get good interviews on," he said. "I'm sure that anyone who witnessed this will never forget it."
The group was tubing on the river when the attack happened.
There was no tubing activities on the Apple River on Sunday.
The four people who were hurt were taken to a local hospital with critical injuries.