Sulli, a 25-year-old K-pop star, was found dead at her residence near Seoul, South Korea, police said on Monday.
Police told BBC that the singer’s manager found her dead at her home and were investigating the cause of her death.
The star, whose real name is Choi Jin-ri and had more than five million followers on Instagram, was a former member of the band F(x) until she left in 2015 to focus on her acting career.
There were reports that said the artist suspended her K-pop work after struggling with the abuse she got online. She first shot to fame in 2005 aged just 11, when she played Princess Seonhwa of Silla in the SBS drama Ballad of Sendong.
Sulli was good friends with K-pop star Jonghyun, who took his own life aged 27.
The Busan-born star had phenomenal success during her stint with the girl band. Some of her biggest hit songs include Pinocchio (Danger), Electric Shock and Hot Summer.
Her association with the band came to an end on 24 July 2014, when it was announced Sulli would be taking a break from the group. On August 2015, it was confirmed Sulli had officially withdrawn from f(x).
Sulli’s last Instagram post came a day ago when she shared a video of a gift from the bag range Stretch Angels.
The artist paid tribute at his funeral in 2017.