It is reported that the helicopter belonged to the company Ascension Wisconsin Spirit, which is engaged in air and ground medical evacuation.
The Ascension Health Spirit helicopter crashed in a heavily wooded area near Hazelhurst.
Investigators from the National Transportation Safety Board (NTSB) are on the scene sifting through the wreckage in order to determine the probable cause of the helicopter crash.
Air Methods and Ascension previously announced that both ground and air medical transport would be suspended until further notice. Ascension said in a statement that it's working with emergency service partners and medical transportation colleagues in the region to meet patient needs.
Christina Ward, a spokeswoman for Air Methods, which provides aviation operations for Ascension, said one of its pilots was among the dead.
The accident is now under investigation by the NTSB and FAA (Federal Aviation Administration).
The last known contact with the pilot was at 10:55 p.m. Oneida County dispatch received a 911 call about 11:22 p.m. Hess said deputies located the crash site roughly 1 a.m. Friday morning. "We are a small, close community and this affects the entire Wisconsin air medical family".
Authorities in northern Wisconsin say the three people killed in the crash of a medical helicopter were flight crew members.
It is reported that the helicopter went missing on Thursday, April 26.
The Associated Press reports at least eight agencies were involved in the search.
The story will be updated as more information becomes available.