Here is an alternative if no one comes through. If he died in Ohio in 1957 his name will ahow up on an index that is available to those that subscribe to ancestry.com. Go to this web site and ask for a lookup of the death record. There is no cost. http://genforum.genealogy.com/recordlookups/http://genforum.genealogy.com/recordlookups/ You should get the exact date of death and the number of the death certificate. The certificate can be purchased from the Ohio Dept. of Health for a modest sum. That will get you the exact cause of death.