SEOUL, SOUTH KOREA. (THECOUNT) — Choi “Sulli” Jin-ri, the former member of top South Korean girl group f(x), was found dead on Monday, police said.

The body of Jin-ri, 25, was discovered at her home in Seongnam, south of the capital, Seoul, police said.

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Jin-ri was later known as an anti-bullying activist.

“Her manager visited her home after failing to reach her since their last call the night before,” police said in a statement.

Sulli was grappling with severe depression, police said. They did not elaborate.

Sulli debuted with the five-member f(x) in 2009. It became one of the most popular girl groups in South Korea and helped fuel the global K-pop craze, reports YahooNews.

Sulli left the group in 2015 an launched a career as a solo singer and actress.

Most recently, she appeared on a television program in which K-pop stars discussed their experiences with malevolent online comments.

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Geo quick facts: Seongnam is the second largest city in South Korea’s Gyeonggi Province after Suwon and the 10th largest city in the country. Its population is approximately one million. Seongnam is a satellite city of Seoul – Wikipedia.