Tiger Woods says that his mother, Kultida, has died at age 80. The golfer credited her for his success and encouraging his signature look of red shirts.

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.

The pro golfer is mourning the loss of his late mother, Kultida. Learn more about the woman who raised Tiger and his dad here.