Sydney Weston, 8, died after suffering a medical emergency on the Chicago bound flight which landed in Peoria. When the plane landed she had no pulse.

Officials in Illinois are investigating after an 8-year-old Missouri girl suffered a medical emergency on a commercial flight Thursday and died.

The child, identified as Sydney Weston of Carl Junction, was traveling with her family on vacation when she “suddenly became ill and then unresponsive in flight”, the Peoria County Coroner’s Office released in a statement following the incident.

The tragedy took place on a SkyWest Airlines flight that originated from Joplin, Missouri bound for Chicago, Peoria County Sheriff Chris Watkins said.

According to the online site Flight Aware, which tracks flight paths, SkyWest Flight 5121 departed from the Joplin Regional Airport at 5:51 a.m. and, after 42 minutes in air, made an emergency landing at the Peoria International Airport in Illinois.

“Her family immediately notified the flight personnel of her condition, and they began rapidly rendering aid,” the coroner wrote.

A SkyWest spokesperson told USA TODAY the plane, operating as United Express, diverted to Peoria and was met by paramedics to attend to the passenger in medical distress.

“We appreciate the efforts of our crewmembers who responded quickly to assist and the medical personnel who met the aircraft,” officials released in a statement Friday.