Conversation so far:
What caused Jayan's death?
Jayan was killed in an accident on the set of the movie Kolilakkam (English: Shockwave).
Where was the movie set?
the movie was being filmed in Sholavaram, near Madras, Tamil Nadu.
Who was starring in the movie with him?
co-star Balan K.
Nair.

Question: What caused the accident?
Self-contained rewrite: What caused the accident that resulted in Jayan's death?