Usher's 11-year-old stepson has been declared brain dead by doctors following the accident Friday when he was struck by a jet ski ... TMZ has learned.
According to our sources, Kyle Glover (son of Usher's estranged wife Tameka Foster) has not experienced any brain activity since he was admitted to the hospital. We're told there has been no decision yet as to whether or not to take him off life support.
Pictured: A picture from 2007, shows Usher and Tameka Raymond during happier times. The estranged couple is currently going through a bitter divorce battle. (Photo by Ethan Miller/Getty Images0