Beyoncé's Uncle Butch Dead at 77

Tragedy has hit Beyoncé's family ... the megastar's uncle has passed away.

Bey's mom, Tina Knowles, delivered the news on Instagram just hours ago, revealing her brother, Rowland Martin Buyince, who went by Butch, died over the weekend. No word yet on how what happened.

Tina uploaded a black and white photo of Butch in a United States Air Force uniform with a caption honoring his memory.

She called Butch her "Beautiful big brother" who was now with God in heaven, while expressing she'll miss him "so much."

She described Butch as a handsome "career Airforce man” who had a passion for riding motorcycles and was a black belt in karate.

Tina noted Butch's "beautiful green eyes," while emphasizing that he was a "great story teller" and was beloved by his incredible wife Jeanette, daughter Dana, and two grandchildren Yvette and Roland.

So far, Bey has not commented on Butch's passing ... but we expect something from her to down the pike.

As you know, Bey's been making headlines lately with her recent pivot to country music, releasing the hit country song, "Texas Hold 'Em."

Butch was 77.