Del. Code tit. 12, § 210

Whoever wilfully adds to, alters, defaces, erases, obliterates, mutilates, blots, blurs, hides, conceals, destroys, misplaces with intent to conceal or commits an act of theft of any instrument of writing purporting to be or in the nature of a last will and testament and intended to take effect upon the death of the testator, whether the person shall have been given custody or possession thereof by the testator, or shall have obtained custody or possession of the purported last will and testament in any other manner whatsoever, shall be guilty of a class E felony.