CHICKALOON, Alaska (KTUU) UPDATE 5:55 p.m.
The Alaska State Troopers have released the identity of the person fatally injured in a rafting incident Saturday afternoon.
According to the trooper dispatch, Martin Rinke, 63, of Sutton, "succumbed to injuries received and was pronounced deceased at the scene."
Troopers wrote Rinke's next of kin has been notified and the body will be sent to the state medical examiner's office.
Investigators determined the raft overturned in the river near the Lion's Head discharging the people inside.
That area of the river is known to have class III and IV rapids.
It's unclear at this time if the raft is part of a commercial company's fleet or was for private use.
AST said no foul play is suspected.
UPDATE: Emergency officials with the Mat-Su Borough say the deadly incident happened near mile marker 105 of the Glenn Highway.
According to Otto Feather, Director of Emergency Services in the Mat-Su, bystanders made the initial call reporting, "folks in the river were in trouble" around 1 p.m. Saturday.
Feather says emergency officials are using radios to communicate as cell service is spotty in the area.
An incident on the Matanuska River near Chickaloon has led to one fatality.
Tim DeSpain, Public Information Supervisor for the Alaska State troopers says a raft overturned on the Matanuska River carrying four people.
Three people were able to escape while one passed away, he said.
They could not confirm what happened to the person who died or the status of possible injuries for the three other people.
Both DeSpain and Mat-Su emergency officials say due to the location of the incident, getting information is difficult.
This is a developing story and will be updated as more information becomes available.