After Amanda Knox, the U.S. college student cleared of murdering her study-abroad roommate in Italy was released from prison after four years, she will finally be coming out about the details of her grisly murder case -- in an interview with Diane Sawyer on ABC News.

Knox, 25, will discuss the case with Diane Sawyer in an interview to be broadcast on April 30, the same day her book, "Waiting to be Heard" -- about her experience with the case -- is released, Reuters reported. 

In 2007, Knox was convicted of murdering her British roommate, Meredith Kercher in a sex-fueled crime in the Italian hill town of Perugia. She was sentenced to 26 years in prison, according to Reuters.

Kercher's half-naked body was found in the apartment she shared with Knox in Perugia, where they both were studying at the time, Reuters reported.

Both Knox's crime and trial drew worldwide attention in the U.S., prompting criticism of the Italian legal system, according to Reuters.

ABC told Reuters that Knox will divulge details she never shared before about her experience as an American study abroad student serving time in Italy.

NBC, ABC and CBS producers have long been fighting to secure interviews with Knox, partly by getting to know her family and friends, The New York Times Media Decoder reported. During the appeals trial, there was a dispute about whether an ABC producer had babysat two daughters of Curt Knox, Amanda's father -- after a published New York Post article said this was the case.

As reported by MediaBistro.com last year, Curt wrote to the Post saying that this is absolutely false: One of ABC's producers, Nikki Battiste, was very kind to offer to let the girls stay in her hotel room during court sessions. However, the NY Post article refers to this kind gesture as "babysitting." This is an outright lie, as at no point in time did Ms. Battiste stay in the room and babysit my younger children. She was accomplishing her required job functions in the courtroom and during shoots with Elizabeth Vargas and various other talent."

Some network producers were on the same plane as Amanda Knox when she returned to the U.S. in Oct. 2011, according to The New York Times Media Decoder. Knox connected with Bob Barnett, the Washington lawyer who represents many authors, politicians and TV reporters to negotiate her book and her first TV interview. The interview, the The New York Times Media Decoder reported, is an important way to sell books.

Although the networks, for the most part, say they generally don't pay for interviews, they have been known to license photos, videos and other materials from interview subjects, according toThe New York Times Media Decoder. But an ABC spokesperson told The New York Times Media Decoder that Knox was not compensated at all for her interview.

Instead, ABC offered an hour in prime time, interview teases on "World News," "Good Morning America," "Nightline," ABC's local TV and radio affiliates and exposure on Yahoo through ABCNews.com's affiliation with the page, The New York Times Media Decoder reported.