Kyle Busch's last tweet will break your heart

Kyle Busch was one of NASCAR's greatest legends. Was . It's that keyword that changes the tone completely and makes the rest hard to come to terms with.

The two-time NASCAR Cup Series champion tragically passed away on May 21 at the age of 41 , following a battle with a severe illness. Busch was rushed to the hospital earlier in the day, according to his family. And as tributes pour out all over social media, it's important to remember that his family is hit the hardest.

NASCAR fans might've known the driver for his aggressive style and moxie outside of the car, but his two kids, Brexton and Lennix, knew him as just their father. And Samantha, his wife, knew him as a husband. It was just on May 18 that Busch was tweeting a birthday message to his son Brexton, who was starting a racing journey of his own.

We hope you have some tissues nearby: "Happy Birthday @brextonbusch!!! " Busch wrote on X. "Your mom & I are so proud of who you’re turning out to be!