Published on: February 28, 2003

In a bombshell new development in the O.J. Simpson saga, some family members now believe O.J.'s daughter Sydney saw her father murder her mother, The ENQUIRER has learned exclusively.

Sydney repressed her horrifying memories for years, but they're working their way to the surface, relatives say -- and they were an underlying factor in the blowup with her dad that led to the 17-year-old's much-publicized 911 call in January.

The issue that goes on sale Friday reveals the scenario that family members believe unfolded on the night of Nicole Simpson's murder, tells why Sydney repressed the memories of what she witnessed … and more.