THE AIRPLANE COLLIDED WITH A TREE DURING LOW ALTITUDE MANEUVERS OVER THE PLTS SISTER'S HOUSE. WITNESSES REPORTED THAT THE AIRPLANE INITIALLY MADE 1 OR 2 DESCENDING LEFT TURNS. THE BANK ANGLE INCREASED SIGNIFICANTLY AT LESS THAN 100 FT AGL, WHICH LED TO AN INCREASED DESCENT RATE. THE AIRPLANE SUBSEQUENTLY COLLIDED WITH A 30 FT HIGH TREE LOCATED ON THE SOUTH END OF A NORTH-SOUTH ORIENTED ROW OF TREES, WHILE ON A NORTHERLY HDG. THE BANK ANGLE AT THE TIME OF IMPACT WAS BETWEEN 45 & 60 DEGREES. EXAM OF THE WRECKAGE REVEALED NO EVIDENCE OF PRE-EXISTING MECHANICAL MALFUNCTION OR FAILURE. A NEPHEW OF THE PLT REPORTED THAT THE PLT HAD PERFORMED LOW ALTITUDE TURN MANEUVERS OVER HOUSE ON PRIOR OCCASIONS WHICH CULMUNATED IN PULL-UPS NEAR GROUND LEVEL. POST- MORTEM EXAM OF THE PLT BY A PATHOLOGIST REVEALED NO EVIDENCE OF ANY CONDITION WHICH MAY HAVE BEEN CAUSALLY RELATED TO THE ACCIDENT.