Two boaters who drowned on Center Hill Lake last week were most likely the victims of a capsized boat, authorities said.The state medical examiner’s preliminary autopsy report concludes that both Robert Tramel, 71, and his niece, 49-year-old Barbara Beach, drowned.According to TWRA Officer Tony Cross, no foul play is suspected in the incident.“We have not yet recovered the boat, but we think it overturned,” Cross said. “A combination of the cold water and the lack of lifejackets resulted in the drowning of both victims.” Cross said neither victim was wearing a lifejacket when they embarked from the Redneck Beach area on Holmes Creek Road Wednesday on a fishing trip in a small flat-bottom boat Wednesday.A fisherman spotted Beach's body just after 5 p.m. Wednesday in 12-14 feet of water.