's father hit the actor so fast and hard ... his dad was suffering from stage 4 cancer leading up to the actor's own death., died from fluid buildup around his lungs and heart, with stage 4 cancer in those same organs ... this according to his death certificate.
The doc, obtained by TMZ, shows Angus' dad had stage 4 mesothelioma ... which may explain why his sudden passing hit Angus like a ton of bricks.
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