Jesus couldn't have been more clear about the OT:
"Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil. For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled. Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven." Matthew 5:17-19 (KJV)
In other words, according to Jesus, everything in the Old Testament—all of those bizarre laws and the petulant god—counts. Only someone that ignores the clear words of Jesus could possibly discount anything the OT.
So, bearing this fact in mind, this crazed man may every well have been following the rules of the OT which were endorsed by Jesus as the law of god. All we need now is the motive. If he killed her for being an atheist, he's in the clear (2 Chronicles 15:12-13).
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