Tex. Education Code § 28.0254

(a) Notwithstanding any other provision of this code, but subject to Subsection (b), on request of the student's parent, a school district shall issue a high school diploma posthumously to each student who died while enrolled in the district at the end of the school year in which the student was expected to graduate under the regular schedule of school attendance. The high school diploma may not be issued before the graduation date of the class in which the student was enrolled at the time of death.

(b) A school district is not required to issue a high school diploma to a student described by Subsection (a) if the student at any time before the student's death was convicted of a felony offense under Title 5 or 6, Penal Code, or adjudicated as having engaged in conduct constituting a felony offense under Title 5 or 6, Penal Code.