Scottish steeplechase jockey Campbell Gillies, 21, died Monday in what is being called a ‘swimming pool incident’ while on holiday in Kavos, Greece.

Gillies, who rode regularly for Kinross, Scotland-based trainer Lucinda Russell, was taking a short vacation with Russell’s head lad, Mark Ellwood, and fellow jockeys Nathan Moscrop, Henry Brooke and Harry Haynes. Gillies was planning to celebrate his 22nd birthday on Wednesday.

A promising steeplechase jockey, Gillies had notched the biggest win of his young career in March, when he won the Albert Bartlett Novices’ Hurdle aboard Brindisi Breeze at the Cheltenham Festival. Gillies had tallied 131 career victories as of Sunday.

Tragically, his Cheltenham winner, Brindisi Breeze, was killed last month after he jumped a paddock fence and was hit by a truck on a nearby road.