Kultida Woods, the mother of Tiger Woods, golf’s biggest star, died Tuesday, according to the 15-time major winner. He did not provide give her cause of death.

Tiger Woods is mourning a significant loss in the family. The golf legend announced on social media that his mother, Kultida Woods, died early on Tuesday. She was 78. Woods, who has yet to play on the PGA Tour this season, made the announcement with “heartfelt sadness.” No cause of death was announced.

Kultida Woods, whose guidance and support helped propel her son, the professional golfer Tiger Woods, to become one of his sport’s most dominant athletes, died on Tuesday. She was 80.