It's tough to discuss without spoilers, but there's no way he could get consent, right? And there's no family to seek consent from (save his mother who didn't seem lucid enough to consent) but he did have consent from the other people he interviewed.

I don't even know.. I felt uneasy listening at times due to this exact question, but I don't think it was unethical at all.

I guess it's Journalistically Ethical, but as a person it just didn't see morally right to me. I think it went from telling a compelling story to airing something the subject didn't explicitly disclose, and in some regards intentionally masked.