Kristoff St. John’s ex-wifeMiais paying tribute to the late actor exactly one year after hisdeath.

“I’ve died twice in my life already. The day my son passed and the day #superbowlsunday last year when his father passed?,” she captioned the post, which included several photos of the late father and son.

“2020 will be my rebirth ????????For them and all the others that continue to suffer #mentalillness #addiction#depression #anxiety #ptsdawareness ??,” the five-time world boxing champion added.

In an exclusive interview with PEOPLE in December, Mia said her upcoming bookFighting For My Lifewill address how the deaths of Kristoff and Julian led to her passion for spreading awareness about mental health.

Kristoff St. John and Mia St. John.Ron Galella, Ltd./WireImage

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“I’ve been in this fight for reform of our mental health system for so Iong,” Mia said. “Kristoff and I lost our son in a mental health facility that was found guilty of neglect. Then when I uncovered a lot of the facilities in LA County, I discovered that this was going on everywhere because there have been many deaths. My son wasn’t the only one. So I’ve been on that vision.”

Mia St. John.

Mia St. John

“They love their father so much, the beautiful, loving, funny soul that he was/is,” she continued, adding a green heart emoji. “#MentalHealth is all we have, nothing else is important.”

But the professional boxer said that despite her intense grief, she’s doing her best to move forward. “I’ve just been telling my daughter, that we have to go on, he’d want us to be happy and to celebrate together,” she told PEOPLE.

source: people.com