Denzel Washington, Chadwick Boseman are posing for a picture: Rich Fury/Getty Images (2)

In a new interview with CBS Sunday Morning, the director and actor, 65, spoke about working with Boseman on Ma Rainey’s Black Bottom, recalling how he told the Black Panther star to marry Ledward after watching her care for him on the set of the Netflix film.

The couple, who was only just dating at the time, married sometime before Boseman’s death in August at age 43, four years after he was diagnosed with stage 4 colon cancer. Ma Rainey’s Black Bottom was the last film Boseman worked on.

“It’s fascinating that nobody knew,” Washington said of Boseman’s private battle with cancer. “Well, credit to him; he kept it to himself. It was nobody’s business. He was there to deliver and he delivered.”

“Certain members of his team knew. His wife was there. They weren’t even married yet,” he added. “And I used to watch how she took care of him, and I actually said to him, I said, ‘Man, you know, you need to put a ring on that finger,’ cause she kept her eye on him and she watched him. And I’m like, ‘Man, she loves that guy.’ You know, but I didn’t know what we know now.”

I used to watch how she took care of him, and I actually said to him, I said, ‘Man, you know, you need to put a ring on that finger,’ ” Denzel Washington rememberedBoseman and Ledward — who had been romantically linked since 2015 — got engaged in October 2019. His family confirmed that the couple had secretly wedded when announcing his death in August on the late actor’s social media accounts.

Simone Ledward, Chadwick Boseman standing in front of a crowd: Kevork Djansezian/Getty Images Simone Ledward and Chadwick Boseman© Provided by People Kevork Djansezian/Getty Images Simone Ledward and Chadwick BosemanPrior to their engagement, Boseman and Ledward made their red carpet debut at the Screen Actors Guild Awards in January 2019 when Boseman was nominated for Black Panther. Later that year, at the 50th NAACP Image Awards, the actor received the outstanding actor in a motion picture award for his starring role in the Marvel film and paid tribute to Ledward in his acceptance speech.

“Simone, you’re with me every day. I have to acknowledge you right now. Love you,” Boseman said in his speech as Ledward mouthed back the words, “I love you.”

Last month, Ledward was granted the authority to administer her late husband’s estate, according to a court order obtained by PEOPLE. She had filed a petition to be appointed the administrator in October.

Kevork Djansezian/Getty Images Chadwick Boseman and Taylor Simone Ledward 

In Ma Rainey’s Black Bottom, Boseman stars as trumpet player Levee. In November, Netflix confirmed its plan to campaign the late star as the lead actor in the film for the upcoming awards season.

Should Boseman be nominated for Best Actor at the 2021 Academy Awards, he will be the first posthumous nominee in the category since Massimo Troisi for 1995’s Il Postino. If he is nominated for Best Supporting Actor, he would become the third person in Oscar history to do so, following Ralph Richardson in 1984’s Greystoke: The Legend of Tarzan, Lord of the Apes and Heath Ledger in 2008’s The Dark Knight.

Ma Rainey’s Black Bottom premieres on Dec. 18

Denzel Washington witnessed the love between the late Chadwick Boseman and his wife, Taylor Simone Ledward.