Kyle Busch's cause of death

New details have emerged regarding the sudden passing of NASCAR star Kyle Busch, with his family confirming the cause of death as sepsis resulting from severe pneumonia.

The racing community gathered for a poignant moment of silence at the Coca-Cola 600, where Busch's wife and 11-year-old son were seen for the first time since the tragedy.

Tributes also poured in from the Indianapolis 500, where the scoring pylon was lit up in his honor during lap 18.

Busch, 41, was a two-time Cup Series champion whose death has left a profound void in American motorsports.