At 1505 eastern time, a Piper PA-16 a Betts RV-6A collided in mid-air while on approach to runway 27R at Lakeland-Linder Regional Airport during Sun n Fun. The Piper pilot was seriously injured and the RV-6 pilot was killed. The local controller said the RV-6 was in front of the PA-16 on the downwind and on base. He saw the PA-16 overtaking the RV-6 and twice instructed the RV-6 to sidestep to runway 27 left, but the pilot did not respond to his instructions. He then told the PA-16 pilot to climb and he did not respond to the instructions.