Preliminary report says "lung ailment."

NFL great Reggie White may have died because of a respiratory disease combined with other health problems, a preliminary autopsy report said Monday.

White most likely had a condition that affected the amount of air his lungs could hold, resulting in "fatal cardiac arrhythmia," said Dr. Mike Sullivan, the medical examiner for Mecklenburg County and a forensic pathologist.

The report issued by Sullivan's office also said sleep apnea may have been a factor.

The report is a preliminary one; determining a final cause of death could take up to three months, Sullivan's office said