Results show a nine-foot mako shark that washed up at Corpus Christi had nothing in its stomach and intestines.
Experts say the shark likely had been sick and was weak enough to be carried toward shore by a current.
Texas A-and-M/Corpus Christi biologist David McKee examined what he described as a 16- or 17-year-old female shortfin mako shark.
Students on December sixth spotted the 440-pound shark in about one foot of water on the university beach.
Shortfin mako sharks are usually found off the California coast. They almost never turn up in Texas bays.
McKee says experts will be looking at different body parts to try to determine what killed the shark and why she was so far out of range.
Results are expected in late January.