My only suggestion to resolve this matter for "free" is to go down to your local library. They should have all of the newspapers on microfilche or microfilm and from there you could begin searching for your fathers death notice or any info that was published. Once you figure the exact date and time then you can attempt to contact your local city hall or county clerks office and request the death certificate. It is all part of public record. If there were any criminal charges you can also check with the court system in your area and they will guide you in the right direction.