Nick Cannon has marked the one-year anniversary of the passing of his and Alyssa Scott’s son, Zen, with a touching tribute post shared to his official Instagram.

“I can’t believe it’s been a year already since the toughest day of my life occurred,” Cannon wrote in the post, which also included several photos of his late son, who tragically died of a brain tumor last year. “Such a painful anniversary. Losing a child has to be the heaviest, most dark and depressive experience that I will never get over. A mixture of guilt, pain, and sorrow is what I suppress daily.”

In the same post, Cannon also addressed his recently revealed hospitalization due to pneumonia. According to Cannon, he’s now physically “on the mend” but is still “broken” in the mental and spiritual sense.

“I know a few days ago I wrote a post from my hospital bed saying I will be okay and I just needed rest so don’t waste your prayers on me but I can definitely use those prayers right now,” he told fans on Monday.

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In June, Cannon and Scott marked their late son’s birthday by announcing the establishment of a pediatric cancer foundation, Zen’s Light. The goal of the foundation, per Cannon, is to “foster global excellence in hope, grief care, and pediatric healthcare” for those in need.

“June 23rd will forever be a day of celebration,” Cannon said at the time.