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.

Kultida Woods, the Thai-born mother of Tiger Woods who instilled his dominant spirit and encouraged him to wear a red shirt on Sunday as his power color, died Tuesday.

Tiger Woods announced that his mother, Kultida, died on Tuesday morning. No cause of death was immediately available. “My Mom was a force of nature al her own, her spirit was simply undeniable,” Woods said in a statement on social media.