Galveston County Medical Examiner Stephen Pustilnik says Wednesday that officials have confirmed the first death in nearby Brazoria County.
Pustilnik also says at least three people who died in Galveston County had serious medical conditions prior to the storm but did not evacuate.
Two needed dialysis treatment and another was a woman cancer whose breathing machine lost power in the storm.
Pustilnik says search teams found another victim drowned in a truck and a fifth was found in a hotel.