A former member of top South Korean girl group f (x), who had spoken out against cyberbullying, was found dead on Monday, police said. The body of Choi Jin-ri, better known by her stage name Sulli, 25, was discovered at her home in Seongnam, south of the capital, Seoul, police said. “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. She left the group in 2015 and launched a career as a solo singer and actress. Most recently, she appeared on a television programme in which K-pop stars discussed their experiences with malevolent online comments. How the K-pop sex scandal exposes Korea’s culture of toxic masculinity Her death sent shock waves through the K-pop fan community. “I always adored and respected you for your boldness. All I can say is rest in peace,” a fan commented on Sulli’s Instagram account. “In heaven, you don’t have to act strong or pretend everything is okay,” another fan said. “I hope you will only think about yourself there.” If you, or someone you know, are having suicidal thoughts, help is available. For Hong Kong, dial +852 2896 0000 for The Samaritans or +852 2382 0000 for Suicide Prevention Services. In the US, call The National Suicide Prevention Lifeline on +1 800 273 8255. For a list of other nations’ helplines, see this page .