Hans Reiser's mother took the witness stand at her son's murder trial Monday, offering a different explanation about what she thought happened to her daughter in law than what she told police days after Nina Reiser vanished last year.

On the witness stand for hours, Reiser's mother, Beverly Palmer, sat stone-faced and appeared agitated. Her answers were often elusive. "Mmmmhhhhmmmm," she often responded to prosecutor Paul Hora's questioning.

Minus her fiery red-dyed hair -- her withdrawn cheeks and inset eyes were a mirror image of her son, the developer of a once-popular Linux file system who is being held in jail here without bail. He is accused of murdering his wife, Nina Reiser, on Sept. 3, 2006, to end a bitter divorce.

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Also: Hans Reiser Trial: Dec. 3, 2007