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Continuity mistake: When Karen, Matt and Foggy are in Matt's office discussing, Karen looks over at Foggy and has her hair raked back over and behind her ear. When it cuts to a close up of her, she now has a lock of hair down over her cheek. (00:17:15)
Chosen answer: After some research, I can say that no, Cass is not a character of Marvel, nor is he present in the Netflix show. As far as I can tell, it's either a real person, or a random name chosen for the coffin, most likely the former. In another season of Daredevil, the show utilized a real cemetery displaying real names in the tombstones.