A pharmaceutical expert says a problem with a lethal injection drug that caused the last-minute postponement of an execution in Georgia was likely caused by shipping and storing the drug at a temperature that was too low.

State officials on March 2 called off the scheduled execution of Kelly Renee Gissendaner, saying the lethal injection drug they intended to use appeared "cloudy."

The state Department of Corrections on Thursday released lab reports, a sworn statement from a pharmaceutical expert hired by the state and a short video showing a syringe of clear liquid with chunks of a white solid floating in the solution.

Gissendaner's attorneys did not have a comment on the analysis.

Gissendaner would have been the first woman executed by the state in 70 years.