A mentally ill black man who died in a Milwaukee prison in April suffered from severe dehydration, a medical examiner concluded. Inmates said he was begging for drinking water days before perishing in custody. Terrill Thomas, 38, was sent to jail after two shooting episodes in which he allegedly was involved on April 14. In one he shot his best friend in the chest after suspecting him of trying to steal Thomas’s car. In another one hours later, Thomas opened fire at Potawatomi Bingo Casino and told everyone to leave. After being arrested, he told investigators there were a lot of snakes in the casino and it looked suspicious. Thomas suffered from bipolar disorder and, according to his family, had experienced a mental breakdown at the time of his arrest. His mother asked the police to take him into custody, saying her son had become violent and erratic.