re: What Sopranos death bothered you the most?

A lot of good answers and discussion in this thread.

My answer, which one 'bothered' me the most, mirrors Tony's reaction.

Tony's Amour Fou with Gloria Trillo is one of my favorite arcs of the show. I love the scene where Tony is eating breakfast in the kitchen one morning, halfway disinterested in what Carm is talking about (her Mercedes wagon) until she mentions that Gloria drove her home from the dealership after Carm left her car for a service tuneup. Carm is oblivious to Gloria's manipulation into her thoughts, but Tony knows exactly what's happening and hides his disgust from Carm and storms off.

A few weeks after he ends contact with her (through Patsy's intimidation tactic in a GREAT episode closing scene), he and Carm are laying in bed one night when she tells him that she heard the oddest thing at Mercedes. Another worker there told Carm that Gloria had killed herself. At this point Tony is rolled over in bed away from Carm, face towards us, and his utter shock and disbelief and horror is evident and Carm brushes his silence off as "Mister Empathy over here." [Tony mouth agape, eyes open] "She hung herself. From a chandelier."

It's an off-screen death but it's brutal to hear about someone else's death, particularly a suicide, especially when you consider the crazy fling Tony and Gloria had and how awful they were for each other.