Sad news in the golf world ... PGA Tour star Jason Day's mom has passed away following a lengthy battle with cancer.
The 34-year-old golfer made the heartbreaking announcement on his Instagram page Thursday ... saying his mom, Adenil "Dening" Day, died on Wednesday night five years after she was diagnosed with lung cancer.
"We are heart broken but incredibly grateful for the gift we had in her living with us for the last almost two years full time," Day said. "She fought so hard until the very last breath."
According to the PGA Tour, Dening passed away peacefully with Jason and other family members by her side.