Conversation so far:
What caused Indian actor Jayan's death?
On 16 November 1980, Jayan was killed in an accident on the set of the movie Kolilakkam.
Where was the movie Kolilakkam set?
Kolilakkam was filmed in Sholavaram, near Chennai, Tamil Nadu.
Who was starring in the movie Kolilakkam with Jayan?
Madhu, Sukumaran

Question: What caused the accident?
Self-contained rewrite: What caused the accident that killed the actor Jayan?