(CNN) -- A Missouri state trooper died Friday when the helicopter he was flying crashed on a suburban street.
Sgt. Joseph Schuengel, 47, was a 17-year veteran of the Missouri State Highway Patrol, the last seven of which he spent as a helicopter pilot for the force. He was heading back to the Spirit of St. Louis Airport in Chesterfield, Missouri, when the helicopter went down shortly after 11 a.m. in that town west of St. Louis, according to the Missouri State Highway Patrol.
Authorities said there was no immediate indication as to what caused the crash, and the St. Louis County Police Department was working with the Federal Aviation Administration and National Transportation Safety Board on the investigation.
No one else was aboard the helicopter when it went down, and no one was hurt on the ground, according to Missouri authorities.
CNN's Erica Henry contributed to this report