Had it Not Been Cancelled

How would you know that?

I think the timing was just an unfortunate coincidence. Clearly Robin had a number of health problems all coalescing at the same time. While he probably did feel bad about the show ending, it's unlikely that it "caused" his depression to go out of control. Cancelled TV shows just don't work that way.

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(Didn't it become some kind of rule after NBC's Newsradio tanked when they replaced Phil Hartman due to his death/murder?)

I wish the show was renewed then he killed himself so Sarah can be the star of the show. She really needs a break somewhere .

Not to say his newer roles are all stupid humor movies. A few were good! I just think it's possible the decline of great movie roles all the time, the show failing and his Parkinson's diagnosis all contributed to his suicide along with any mental illness or sensitive nature he had. I wish he hadn't done it, but even if the show had stayed on his Parkinson's would have gotten worse and made him more miserable. He would have probably committed suicide once people realized it on the show and it would have been hard to hide once it got worse. Michael J. Fox did do a tv show for a little while after his diagnosis because his medicine helped some of the involuntary movement. It became too hard for him at some point though so he quit the show and chose to do voice acting and later did a role with his diagnosis written in for th character. Robin could have done that too but it's likely the show might have even made him commit suicide if it had stayed on if he was ashamed of his body changing while the show aired.