It is not uncommon for this to happen. If the cause of death is listed as "pending", it is because we have to do further testing on tissue and body fluid samples that are retained during the autopsy. This does not delay the release of the body for burial or cremation, however, you can expect that the cause of death will be pending for approximately 12 weeks.
If you are in need of death certificates for legal matters other than life insurance you can order copies with the cause of death pending. Please speak to your mortuary or cremation service staff about ordering them.