THE PLT WAS ON A VFR FLT FROM WICHITA, KS TO ROGERS, AR. WHILE EN ROUTE, HE CONTACTED TULSA FSS & OBTAINED WX INFO. AT THAT TIME, HE WAS ADZD THAT VFR FLT WAS NOT RECOMMENDED DUE TO PREVAILING IFR WX IN THE AREA OF HIS DESTN. HOWEVER, THE NON-INSTRUMENT RATED PLT ELECTED TO CONT DESPITE THE WARNING. HE ARRIVED AT THE DESTN AFTER DARK & ATTEMPTED TO LAND. WITNESSES NEAR THE ARPT HEARD THE ACFT FLY OVER THEIR HOMES, THEN HEARD IT CRASH. A SEARCH WAS INITIATED & IT WAS FOUND APRX 1.5 MI SOUTH-SOUTHEAST OF THE ARPT. INITIAL IMPACT WAS WITH TREES AS THE ACFT WAS ON A HEADING OF 160 DEG. THERE WAS EVIDENCE THE ACFT WAS IN A 50 DEG RIGHT BANK & A STEEP NOSE DOWN ATTITUDE WHEN IT CRASHED. IT WAS EXTENSIVELY DMGD DRG IMPACT. NO PREIMPACT PART FAILURE OR MALFUNCTION OF THE ACFT WAS FOUND. APRX 21 MI SOUTH-SOUTHEAST AT FAYETTEVILLE, AR, THE 1950 WX WAS IN PART: 600' OBSCURED, 1 MI VIS WITH FOG & DRIZZLE, WIND FROM 180 DEG AT 8 KTS. ETHANOL WAS FOUND IN THE PLT'S KIDNEY FLUID & BILE, BUT THERE WAS EVIDENCE OF PSBL DECOMPOSITION OR CONTAMINATION OF THE SAMPLES.