When Did The Simpsons Jump the Shark?

Speculation from last year when producers teased that the start of the 26th season would include the death of a major character:

https://www.youtube.com/watch?v=aKyhbPjXpyU

So who died? A very disappointing pay-off today, as The Daily Mail reports:

It has been almost a year of anxious speculation.

But when the moment came for a ‘major character’ on The Simpsons to be killed off, viewers were less than impressed.

It was Krusty The Clown’s father, Rabbi Hyman Krustofsky.

Which character would you have axed instead? Or is the show just long passed its expiration date? When did you stop watching? Can you pinpoint the season when the show went off the rails?