Kyle Glover, the stepson of R&B star Usher and his former wife Tameka Foster, was declared brain dead on Sunday after the 11-year-old was involved in a jet ski accident on Lake Lanier in Atlanta.

He's bad, Foster told Radar Online about her son who was critically injured on Saturday. Glover has not shown brain activity since he arrived at the hospital on Sunday, according to several reports.

A 15-year-old friend who was with him was hospitalized for a deep cut on the head and a broken arm.

The accident happened when a 38-year-old man riding a personal watercraft struck the inner tube attached to a boat Glover and his friend were sharing. Glover was immediately knocked out and was airlifted to the hospital from the lake.

Sgt. Mike Burgamy of the Georgia Department of Natural Resources said the crash was not alcohol-related and authorities have not released whether or not any charged will be filed from the accident.

According to TMZ, Usher chartered a plane for Foster to get to the hospital and she has not left her son's side.

Usher and Tameka, who were married in August 2007, have two children together, four-year-old Usher V and three-year-old Naviyd. Kyle Glover is the biological son of Ryan Glover and Usher's stepson. The couple's divorce was finalized in November 2009. Radar Online reported that Usher arrived on Saturday night and has been helpful to Foster this weekend.

Kyle, You are strong ... You'll be saved I know it. I love you my baby. I need all #Prayers for my son! thanks you everybody! Tameka Foster wrote on her Facebook page.

So far, the family has not announced whether or not they will continue to keep Glover on life support.