Mo. Rev. Stat. § 513.070: Execution against heir to be special.

When execution shall be issued against any person, as heir or devisee, the officer to whom the same shall be directed, shall be commanded only that of the goods and chattels which were of the ancestor or testator at the time of his death, he cause to be made the debt, damages and costs; and if sufficient goods and chattels cannot be found in his county, then that of the real estate which was of the ancestor or testator at the time of his death, he cause to be made the debt, damages and costs or sum of money in such execution specified.