Police investigating the suicide of late actress Jang Ja-yeon said Monday they will summon journalists to question them over a letter left behind by the actress that suggest she was forced to provide sex by her former agent, according to Yonhap News Agency.

Jang, 30, hanged herself at her house in Bundang south of Seoul March 7. The case took an unexpected turn a few days later when the contents of the lengthy letter Jang is believed to have written was made public by local broadcaster KBS.

In the letter, Jang said her former agent had forced her to provide sexual favors to several high-powered entertainment figures and journalists, bringing to surface widespread rumors of abuse of young and emerging actresses.

Police launched an investigation several days after the contents of the letter were broadcast.

The five journalists facing questioning said they may reject the summons, accusing the investigators of trying to "take advantage" of the press.

"Police launched the probe only after our report was aired. They tried so hard to turn it into a simple suicide case," a KBS reporter said, requesting anonymity. "Now they want to question us, when they should really be focusing on those who are accused of pressuring Jang to provide sex."

Two KBS journalists have been sued for defamation by Jang's family, who were reluctant to reveal the actress' story.

Police said they will also summon Jang's former manager Yoo Jang-ho and several people listed in Jang's letter this week for questioning. They are currently looking into Jang's e-mails and phone call records for more evidence.