To spare others the rather extreme fluff and constant self-derailing of the article:

A scientist who worked with various kind of non-drinkable alcohols died by methanol overdose and this was only found out and investigated much later, with no real conclusion made beyond the assumption that he probably didn't poison himself; but a bottle of liquor he had and emptied maybe, possibly might've been spiked with methanol and he could've died from that. No actual facts are known though, and nobody who might have access to any facts cares to talk to the person doing the investigating.