Change
SELECT [FirstName], [LastName], [MidInitName], [NameSuffix], [NamePrefix], [DOB],
[DOD], [BurialDate], [GeoDirection], [Space], [Lot], [Row], [IntermentSpec],
[AddtlInfo] FROM [OFCInterments] WHERE ([FirstName] LIKE @FirstName)
to
SELECT [FirstName], [LastName], [MidInitName], [NameSuffix], [NamePrefix], [DOB],
[DOD], [BurialDate], [GeoDirection], [Space], [Lot], [Row], [IntermentSpec],
[AddtlInfo] FROM [OFCInterments] WHERE ([FirstName] LIKE @FirstName or
LastName like @LastName)