norma esparza , 40 , is facing six years in state prison after pleading guilty to a reduced charge of voluntary manslaughter .
she is one of four people accused of the 1995 killing of gonzalo ramirez , 24 , who she claims raped her .
a professor in geneva , she was arrested in the cold case murder tin 2012 when she re-entered the u.s. for an academic conference .
she says her ex-boyfriend , gianni van , forced her to identify ramirez and then coerced her to keep the murder secret for almost two decades .
esparza is now testifying at van 's murder trial , which is in its second day .