I ask about Asbestos because it is likely what killed Malcolm.

Basically it was a vicious substance that also killed Christie Hennessy the singer. It was ubiquitous in garage roofs when I was a child. I remember my mother commenting on it. She was terrified of it. I can’t visualize the actual roofs anymore. I think they were slanted. I can’t recall whether you could visually identify something as Asbestos by looking at it.

It will have killed many more than Malcolm. Anyone working on building sites or demolition may have been exposed. Asbestos became dangerous when disturbed.