Federal investigators are still looking for the cause of a medical helicopter crash in northern Iowa that killed three people.
Pilot Gene Grell, nurse Shelly Lair-Langenbau and paramedic Russell Piehl died when the helicopter crashed north of Ventura Wednesday night. They were on the way to Emmetsburg to pick up a patient.
Lair-Langenbau and Piehl worked for Mercy Medical Center-North Iowa in Mason City.
The CEO of the medical transport company that owned the helicopter says the pilot didn't make any emergency call. The helicopter had a satellite tracking system that monitored its position and other information instead of the traditional onboard black box.
Weather was overcast with 10-to-15 mile per hour winds at the time of the crash.