At present there appears to be no historical death records available online for Autauga County, Alabama. You can access the Social Security Index below for recent deaths (post 1962) and utilize the cemetery listings available at this site for records of gravestones. Also, try the probate and estate listings on the court records page. It may be possible that they left a will that was later probated.
Social Security Index (post 1962 deaths)
If you know the date of death for your ancestor, then we suggest that you purchase a death record for your ancestor from the state of Alabama. You can do so from the following link: