Confessions from 'The Killing''s Killer

After an excruciatingly long wait, fans of The Killing finally found out on June 17 who killed Rosie Larsen: Auntie Terry did it! To prepare for the second- season finale of the AMC drama, actress Jamie Anne Allman holed up at home and watched murder confessions she found on YouTube. ''I went deep in myself and thought how I would feel if I did something like that to someone I love,'' Allman tells EW. ''And I wasn't allowed to tell anybody.'' Remarkably, the actress didn't learn about her tragic (albeit unwitting) role in the murder until two hours before the table read. ''[Executive producer] Veena Sud called me. I thought I was in trouble,'' Allman recalls. ''She was like, 'Well, Terry, you're the killer.' I was in shock. And then I just started to cry. I felt like such a nerd! I felt so bad for Terry.'' With any luck, fans won't have to wait nearly as long to learn whether AMC will order a third season of the serialized drama — but Allman doesn't see any reason why they won't. (For now, the network isn't saying.) ''They have a whole other crime idea set up and in place,'' Allman says. ''It should be exciting. Mireille Enos [Sarah Linden] and Joel Kinnaman [Stephen Holder] are such an amazing pair. They have great chemistry.''