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If the fish stuck to the filter, it means either it was already dead or it was extremely weak. Healthy fish normally would not be stuck to a filter. Just what readings do you get from your last test results? Ammonia? Nitrite? Nitrate? PH?
How often do you feed? How often and how much do you do partial water change?
Has the Molly been giving birth lately?
I have also found that livebearer seem to shorten their life span quite a bit when they give birth frequently. Several of my Platy (also livebearer) didn't live long when they were pregnant constantly. While a few other female Platy in the tanks without any male has lived for much longer time.
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