At 6:30 p.m. Korean Standard Time, South Korean police received a report about a death at Hara's home.
She was found unconscious by her manager at her home in Seoul's Gangnam district.
At the time of writing, police were still investigating the case of Goo Hara.
Hara, who was a member of the K-Pop group Kara, was hospitalized in May after what police had said was a suicide attempt inside her apartment, according to BBC News. The 28-year-old was found dead around 6pm. Her official fan website listed photography, reading, and exercise as her hobbies, while adding that driving was her specialty.
In a statement sent to reporters, SM Entertainment, Sulli's agency, said her death was "very hard to believe and sorrowful". She had accused her ex of having threatened to circulate a sex video of her. But from now on, I will steel my heart and try to be healthy.
Hara's death comes a month after another former K-Pop singer, Sulli, was found dead and authorities suspect that was suicide.
Goo's last post on Instagram, published Saturday, was a photograph of herself in bed with the caption: "Good night".
Hara joined Kara in 2008. She later left the band to pursue her solo career, releasing music as well as appearing in many films and TV shows.
In the years before her death, Sulli had been the subject of intense online hate comments. She later recovered, released a new single and did a short tour earlier this month. The 25-year-old was known for her feminist voice and outspokenness that was rare among female entertainers in deeply conservative South Korea.