A Warren County Jail inmate died Christmas morning after being booked for drunk driving on his birthday.The man, Trinity Lynn “Trent” Bouldin, 35, died at River Park Hospital in the early morning hours on Christmas. The cause of his death remains under investigation, pending the results of an autopsy that was conducted.According to Sheriff Jackie Matheny, Bouldin was brought in around 8:45 p.m. on Christmas Eve. He had been arrested on charges of driving on a revoked license and DUI. He had undergone sobriety tests prior to being brought in for booking and was charged with drunk driving after performing poorly on those tests.The sheriff said Bouldin was placed in a holding cell by himself and apparently dozed off shortly after being placed in the cell.