Wrong, he died from Cancer. Only in the past few years this conspiracy theory surfaced. It is well known he was very ill way before the military coup. In fact, the left wanted him to be the candidate instead of Salvador Allende, but he didn't go for it, because he was involved in medical treatments.

This is just the left trying to rewrite history, and please don’t cite journalists as sources. It is said that journalists have a bast amount of information but an inch of depth on it.