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.

Kultida Woods, who was from Thailand, met Tiger's father, Earl, during the Vietnam War. They moved to New York and married in 1969 before settling in California. The 15-time major winner's father died in 2006. The two were married for 37 years.