Mo, a devoted fan of both the Baltimore Ravens and the Baltimore Orioles — the city’s Major League Baseball team — was diagnosed with cancer at 9 years old and eventually lost his vision.

His cancer reemerged in June 2020, and he passed away the following month — just a week after his mother, Sonsy Gaba, told Facebook followers he was being “damn resilient.”

Sonsy announced her son’s passing on July 28. “I lost my best friend today,” she wrote on Facebook, per The Baltimore Sun. “[Your] legacy will live on, love bug.”

On social media, the Ravens posted footage of when Mo helped the team draw up a touchdown during practice and when he announced an NFL draft pick in Braille. “Forever a Raven,” the team wrote. “We love you, Mo.”

The Orioles also honored the teen on Twitter, writing, “Thank you, Mo, for sharing your joy and contagious laughter with the team and all the countless memories we will never forget.”

The MLB team had previously elected Mo into the Orioles Hall of Fame. “Mo’s positive energy has been constant throughout every battle and continues to bring the entire city of Baltimore together in the face of ongoing crisis,” the Orioles said in the election announcement. “His unwavering positivity and kindness are qualities every Baltimorean aspires to emulate. Mo Gaba has impacted more people in his 14 years than most people do in an entire lifetime.”