OAKLAND -- Grand jury transcripts released Friday present an increasingly angry Giselle Esteban sending profane and threatening text messages in the months before the slaying of her former friend, nursing student Michelle Le.

The documents also reveal evidence that Esteban, 27, had plotted to gain information about Le just days before she disappeared from Kaiser Permanente Medical Center in Hayward on May 27. Esteban was indicted Dec. 14 on a murder charge in Le's death.

According to the 470-page transcript, Esteban stated that Le had "dug her own grave" and "would not be around much longer" in text messages sent to Scott Marasigan, the father of Esteban's child, who was also a friend of Le.

Prosecutor Butch Ford told the jury that Esteban believed that Marasigan was having an affair with Le, and could not be convinced otherwise.

"No matter how many times Marasigan denied an affair, Esteban refused to believe him," Ford said. "And she became fixated."