"Praying to the dead is strictly forbidden in the Bible. Deuteronomy 18:11 tells us that anyone who “consults with the dead” is “detestable to the Lord.” The story of Saul consulting a medium to bring up the spirit of the dead Samuel resulted in his death “because he was unfaithful to the LORD; he did not keep the word of the LORD and even consulted a medium for guidance” (1 Samuel 28:1-25; 1 Chronicles 10:13-14). Clearly, God has declared that such things are not to be done."
---Michael Houdmann (Got questions guy)