Police are currently investigating the circumstances of said accident, with the play's staff cooperating with the police for the investigation. Yoshino was an important and irreplaceable part of the production, and they judged that moving forward without him would be difficult, hence the decision to cancel the production.
The play was supposed to star Hiroki Miura (Prince of Tennis Musicals) as Eren Jaeger, Minami Tsukui (Kamen Rider Gaim) as Mikasa Ackerman, and Shogo Sakamoto (Hammer Session!) as Armin Arlert; play was supposed to be directed by Akiko Kodama (Live Spectacle Naruto) with scripts by Takeshi Matsumura.
[Source: Anime News Network]