DeSantis opens up for the first time about 'shattering' death of his sister, Christina, at age 30

• DeSantis opened up for the first time about the sudden death of his sister, Christina, at age 30.

• "It's something I wish I could get back," the Florida governor said.

• DeSantis teared up during the interview.

Florida Gov. Ron DeSantis is slowly filling in some of the details he left out of his new memoir, "The Courage to be Free."

In an interview set to air Thursday on Fox Nation's "Piers Morgan Uncensored," DeSantis opens up for the first time about his only sibling, Christina DeSantis, who tragically died in 2015 from a sudden illness at the age of 30 while in London.

DeSantis teared up as he spoke about Christina, Morgan wrote in excerpts of the interview published Wednesday in the New York Post.

"It was just a shattering experience," DeSantis said. "I remember my mom calling me, my wife and I were on our way back from church on a Sunday morning, and she said that Christina was in the hospital and she had a blood clot but was stable."

But after being in the hospital for a couple of days, Christina developed a fatal pulmonary embolism, which happens when a blood clot blocks the arteries around the lungs. DeSantis said he turned to his Catholic faith amid his grief.

"You start to question things that are unjust, like 'Why did this have to happen?' And you just have to have faith that there's a plan in place, trust in God, there's no guarantee that you're gonna have a life without challenges and without heartbreak and that's just a function of being human."

The moment is a rare glimpse into DeSantis' personal life. The governor has a reputation for being aloof and has received backlash for his more controversial policies. His wife, Casey DeSantis, often shares a softer side of her husband through her own voice.