It's an episode where the killer uses technology to kill his victims - he changes an order of a man in a restaurant, ordering food he's allergic to and re orders. In order to get in touch with him, Mac puts a sign to a camera saying "Call Me". I believe the killer was suffering from a life threatening disease.
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Hi, it's ep. 6x02 "Blacklist (Featuring Grave Digger)"
http://www.imdb.com/title/tt1501851/
http://www.youtube.com/watch?v=DIinL49Rn14