The couple first announced the loss of their son in September

NEED TO KNOW

• B2K’s Raz B and wife Mona Li’s 3-month-old son’s cause of death has been determined
• According to the Fulton County Medical Examiner, the 41-year-old singer and his wife’s son died of “asphyxia due to airway obstruction”
• The 3-month-old’s death was ruled an “accident”

B2K’s Raz B and wife Mona Li’s 3-month-old son’s cause of death has been determined.

According to the Fulton County Medical Examiner, the 41-year-old singer and his wife’s son died of “asphyxia due to airway obstruction,” PEOPLE confirms. The 3-month-old’s death, which occurred back in September, was ruled as an “accident.”

TMZ was the first to report the news.

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In a statement shared with PEOPLE back in September, David Robinson, the Thornton family publicist and a spokesperson for the couple, confirmed that Raz B, whose real name is De’Mario Monte Thornton, and his wife Li’s son Astro Monte died. USA Today was first to share the news at the time.

“It is with heavy hearts that we announce the unexpected passing of Astro Monte Thornton, beloved son of Mona and De’Mario ‘Raz B’ Thornton of the R&B supergroup B2K,” the statement said. “The family asks for privacy as they navigate this difficult time and appreciates your love and support in advance.”

Alongside Astro, the couple share a son Versai Carter, whom they welcomed in October 2024. Li is also the mother of an older daughter from a previous relationship.

In April, Li revealed the exciting news that she was nine months pregnant in a post on her Instagram. Walking alongside her husband in a few photos, she took a minute to celebrate Raz B ending his Boys 4 Life Tour while acknowledging their growing family.

“Watching my husband complete the Boys 4 Life Tour has been one of my greatest honors. I know what this meant for you & I’m so proud of you! Being able to witness your greatness night after night from the audience but also as your wife means more to me than words can say,” she wrote in part.

“Thank you for letting me share this journey with you babe,” she continued. “9 months pregnant and outside w my man ha. I know you didn’t just do this for yourself you did it for your family, for your future, and for the legacy you’re building.”

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Then, in May, the couple announced they had welcomed their son together in a joint Instagram post. Although they didn’t share a photo of baby Astro at the time, the couple posed alongside their son Versai and Li’s older daughter.

“I always wanted to take a real family picture with my own family… and finally, God made a way 🙏🏾❤️,” the two wrote in their caption. “Right now we’re at the hospital getting ready to welcome our newest addition, Astro 🚀👶🏾 another baby boy to the Thornton family.”

“Big congratulations to my beautiful wife for being so strong through this journey. Watching you become a mother again is one of the greatest blessings I could ever witness,” they continued. “The Thornton family continues to grow… and our legacy does too.”

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