Nim had a reputation as one of the most independent-minded and outspoken members of the Khmer Rouge, and was eventually arrested, tortured and executed at Tuol Sleng security prison in 1977 during a Party purge.
Nim dikenal sebagai anggota bersuara terbuka dan berpemikiran paling independen dari Khmer Merah, dan kemudian ditangkap, disiksa dan dihukum mati di penjara keamanan Tuol Sleng pada 1977 saat perpecahan Partai.