Tammy Wynette died from natural causes and there is no reason to exhume her body for an autopsy, a Tennessee medical examiner said Wednesday. Three of the country singer’s daughters asked Nashville Medical Examiner Bruce Levy to review the case. They say they are suspicious, because the police report said the only drugs Wynette, who was 55 when she died, was taking at the time of her death were antibiotics. They say she was on various prescribed pain medications, including Stadol, Valium and Demerol. Levy said he spoke with Wynette’s physician, Dr. Wallis Marsh, and reviewed her medical records and has no doubt the cause of death was blood clots in her lungs. Wynette’s body was found by her husband-manager George Richey in their Nashville home last April. Marsh pronounced her dead. No autopsy was performed.