Police said the girl identified as Zhou was a student from the Communication University of China, state-run Xinhua news agency reported.
A WeChat message saying she was missing spread among students and users. The message identified her as Zhou Yunlu, who majored in acting and was in the second year of her graduate studies before her death.
Beijing police acted on a missing-person report from the university late yesterday and arrested a 23-year-old male suspect named Li.
Zhou reportedly was performing in a role for a crew organised by Li.
Further police investigation is underway.