Nerdy sidebar: TCAs are still used for mood disorders when SSRIs/SNRIs are ineffective. TCAs also have adjunctive benefit for other conditions like IBS-D and chronic pain. TCAs don't have the dangerous interactions of other drugs like the MAOIs. Usually, it's the side effects of TCAs that make them used less often than serotonin modulators. Phenothiazines like Thorazine wouldn't be indicated for depression unless there were a concurrent psychosis and even then, it wouldn't be the first line drug used to treat psychotic symptoms because of the extrapyramidal side effects.
In the case of Sean, it's unclear whether the anti-depressants that he had taken before his death were something that he had been prescribed on a regular basis for depression or whether he had obtained them by other means. The leak of the autopsy only indicated that he had taken tricyclics in sufficient quantity that they had resulted in his death. He was found several hours after he died from the overdose. The gossip that was on the internet hinted that he had self-medicated his depression with Molly in the days prior to his death; then when he crashed after the Molly wore off, he took the tricyclic but given the amount that was in his system, there seems to have been intent of self-harm. Texts that he sent his then girlfriend also hint that he knew that he had overdosed.
