You say your brother's name "was" Tommy Corley.I take it that he was killed in the crash, too?
If so, you might be able to pin down the date of his death via the SSDI (Social Security Death Index).You have his complete name and the zip of his last residence...That should help.If you had his SSN, that would be even better.Likewise for Lida Horn.
Once you pin down the date, that will narrow your search for newspapers.Baton Rouge had two newspapers at the time, both operated by the same company.The Morning Advocate was the morning paper; the State-Times was the evening paper.Chances are, the reports were in both.
Also, at that time, the only way to get from Rayne to BR was via Lafayette to Opelousas on US167, then to BR on US190.I10 over the swamp didn't open until about Christmas of 73, if I remember right.
Also, the Lady of the Lake was still downtown next to the Capitol at that time.