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Simon Robert Naali (March 9, 1966 – August 13, 1994) was a Tanzanian marathon runner.
He finished eleventh at the 1993 World Championships in 2:19:30 hours. In addition he won the bronze medal at the 1990 Commonwealth Games. He competed at the 1992 Summer Olympics, where he didn't finish the race. He died in 1994, aged 28 in Moshi, Kilimanjaro, while recovering from injuries suffered in a hit-and-run accident in Tanzania.