Officials in New Braunfels say 23-year-old Derek Joel-Nelson Clemens was found dead Thursday in the swollen Guadalupe River. The search for his friend continues.
Both men went missing Wednesday as flash floods fueled by the storm hit parts of Texas before moving east.
In Oklahoma, a motorist drowned Thursday after trying to drive across a swollen creek. The Highway Patrol says 19-year-old Jackie Warford's vehicle was swept off a road in the eastern Oklahoma town of Stilwell.
Flash flooding has killed at least two motorists in Texas and others are still missing.