20 years ago, the body of Ciara Glennon was found in bushland outside Perth.

Now, Ciara's heartbroken father, Denis Glennon, has learned that the Western Australian Police have arrested and charged a suspect in relation to his daughter's death.

Denis, a native of Westport Co Mayo, has spoken to the press regarding recent developments in the cold case.

He, understandably, expressed a mixture of emotions when discussing the two-decade long investigation.

"This is a very raw and bittersweet time," Ciara's father told Perth Now.

"We are being updated by the Western Australian Police, and hence it is best that I do not comment on the recent developments."

Ciara, who was 27 at the time of her death, had been celebrating St Patrick's Day on March 14 1997 in the Perth suburb of Claremont when she disappeared.

In addition to charges brought forth regarding Ciara's murder, Bradley Robert Edwards has also been charged with the murder of 23-year-old Jane Rimmer.

Ciara and Jane's killings, along with the disappearance of Sarah Spiers, were documented in Australian press as the 'Claremont serial killings'.