DURING ARRIVAL AT NIGHT, THE PLT WAS CLEARED FOR A VOR-B APCH TO THE MOREY ARPT, AN UNCONTROLLED FACILITY AT AN ELEVATION OF 928 FT MSL. RWY 13/31 AT THE ARPT HAD LOW INTENSITY RWY LIGHTS WHICH COULD BE ACTIVATED BY KEYING THE RADIO ON 123.5 MHZ. THE CIRCLING MINIMUMS FOR THE APCH WERE 700 FT CEILING & 1 MI VISIBILITY. DURING THE APCH WITH THE RADIO ON 124.0 MHZ, THE PLT WAS ADVISED THAT THE WX WAS 900 FT OVERCAST, VISIBILITY 7 MI WITH LIGHT DRIZZLE. WHEN THE ACFT WAS ON FINAL APCH, THE CONTROLLER HEARD 3 CLICKS (ON 124.0 MHZ) & ADVISED THE PLT HE HAD LOST RADAR CONTACT. THE PLT RESPONDED BY SAYING THAT HE HAD GROUND COMTACT & WAS CANCELLING HIS IFR CLEARANCE, BUT THAT HE COULD NOT SEE THE RWYLIGHTS. SHORTLY AFTER THAT, THE ACFT COLLIDED WITH TREES AT AN ELEVATION OF APRX 1000 FT MSL, THEN CRASHED & BURNED. THE MDA FOR THE APCH WAS 1600 FT MSL.