Two Eurocopter AS350 Écureuil helicopters collide in mid-air over Villa Castelli, Argentina, killing all 10 people on board both aircraft, including French athletes Florence Arthaud, Camille Muffat and Alexis Vastine, as well as producers and guests for the French TV show Dropped.

The Airbus Helicopters H125, previously the Eurocopter AS350 Écureuil, or Squirrel, is a single-engine light utility helicopter designed and originally manufactured by the French corporation Aérospatiale, and later by Eurocopter, now Airbus Helicopters. In North America, the H125 is marketed as the AStar. The AS355 Ecureuil 2 is a twin-engine variant, marketed in North America as the TwinStar.

On 9 March 2015, two Eurocopter AS350 Écureuil helicopters collided mid-air near Villa Castelli, Argentina, killing all ten people on board both aircraft.

Villa Castelli is a small town and seat of the General Lamadrid Department in the Province of La Rioja, northwestern Argentina. As of 2010 it had a population of 1,697.

Florence Arthaud, was a French sailor. In 1990, she became the first woman to win the Route du Rhum.

Camille Muffat was a French swimmer and three-time Olympic medalist. Swimming for the Olympic Nice Natation club, she specialised in the individual medley and the free style events. Her career ran from 2005 to 2014.

Alexis Vastine was a French boxer who won a bronze medal at the 2008 Summer Olympics in the Light Welterweight division. He also competed in the 2012 Summer Olympics, where he was eliminated in the quarterfinals in a controversial decision. He died in the Villa Castelli helicopter collision during the filming of French TV reality show Dropped for the TF1 network.