Tex. Code of Criminal Procedure § 10

When a body upon which an inquest ought to have been held has been interred, the medical examiner may cause it to be disinterred for the purpose of holding such inquest.

Before any body, upon which an inquest is authorized by the provisions of this Article, can be lawfully cremated, an autopsy shall be performed thereon as provided in this Article, or a certificate that no autopsy was necessary shall be furnished by the medical examiner. Before any dead body can be lawfully cremated, the owner or operator of the crematory shall demand and be furnished with a certificate, signed by the medical examiner of the county in which the death occurred showing that an autopsy was performed on said body or that no autopsy thereon was necessary. It shall be the duty of the medical examiner to determine whether or not, from all the circumstances surrounding the death, an autopsy is necessary prior to issuing a certificate under the provisions of this section. No autopsy shall be required by the medical examiner as a prerequisite to cremation in case death is caused by the pestilential diseases of Asiatic cholera, bubonic plague, typhus fever, or smallpox. All certificates furnished to the owner or operator of a crematory by any medical examiner, under the terms of this Article, shall be preserved by such owner or operator of such crematory for a period of two years from the date of the cremation of said body. A medical examiner is not required to perform an autopsy on the body of a deceased person whose death was caused by a communicable disease during a public health disaster.

Sec. 10a. WAITING PERIOD BETWEEN DEATH AND CREMATION. The body of a deceased person shall not be cremated within 48 hours after the time of death as indicated on the regular death certificate, unless the death certificate indicates death was caused by the pestilential diseases of Asiatic cholera, bubonic plague, typhus fever, or smallpox, or unless the time requirement is waived in writing by the county medical examiner or, in counties not having a county medical examiner, a justice of the peace. In a public health disaster, the commissioner of public health may designate other communicable diseases for which cremation within 48 hours of the time of death is authorized.

Sec. 10b. DISPOSAL OF UNIDENTIFIED BODY. If the body of a deceased person is unidentified, a person may not cremate or direct the cremation of the body under this article. If the body is buried, the investigating agency responsible for the burial shall record and maintain for not less than 10 years all information pertaining to the body and the location of burial.