OAKLAND, Calif. (AP) — The suspect in the slaying of a San Francisco Bay area nursing student was obsessed and increasingly angry with her ex-boyfriend's relationship with the victim and was convinced the two were having an affair, according to grand jury transcripts.

The transcripts — released on Friday — include threatening text messages that Giselle Esteban, 27, allegedly sent to her ex-boyfriend about the victim, Michelle Le, in the months before Le's disappearance from a Hayward hospital parking lot in May, according to the Hayward Daily Review (http://bit.ly/uLCg4e). Her remains were found in a remote area four months later.

In one message, Esteban said her ex-boyfriend, Scott Marasigan, and Le would "pay" for lying to her, according to the 470-page transcript. In another text message sent on March 2, Esteban allegedly accused Le of digging her own grave and being a "home wrecker" and said she wouldn't be an "issue" much longer.

She was even more explicit in a March 18 phone call to Marasigan, according to the transcript, telling him that she would take his life and Le's if he was not honest with her regarding Le.

"This is your last and final warning," Esteban allegedly said. Marasigan apparently recorded the conversation.

"No matter how many times Marasigan denied an affair, Esteban refused to believe him," Alameda County prosecutor Butch Ford told the grand jury. "And she became fixated."

Marasigan testified that he dated Le for two or three weeks several years ago, but they never had a sexual relationship.

Esteban was charged with murder in Le's death in September. She was indicted by the grand jury on the same charge earlier this month, as prosecutors sought to avoid a preliminary hearing and speed the case up.

She has yet to enter a plea and is scheduled to return to court for arraignment on Jan. 20.

According to the grand jury transcripts, Esteban's DNA was a match to a stain on the steering wheel and turn signal of Le's car, and Le's DNA was a match to a stain on Esteban's shoe.