The trade announced Monday brings Najera back to Dallas, where he was a fan favorite in his first four NBA seasons. He played in 39 postseason games with the Mavericks, including 19 in 2003 when Dallas lost to San Antonio in the Western Conference finals.
The native of Mexico was traded to Golden State in the Erick Dampier deal in 2004 and was later sent to Denver. He averaged 3.8 points in 13 games in his second season with the Nets.
Humphries averaged 5.2 points in 25 games for the Mavericks. Williams hasn't played for Dallas since last January.