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In season 2 the Miami-Metro police dept accidentally stumbled into a few dozen cut up bodies in garbage bags in the ocean which were Dexter's lifetime of handy work. His colleague Sargent James Doakes succeeded in tracing the murder back to Dexter but Dexter's new but mentally unsound girlfriend Lila managed to finish him off before Dexter get to figure what to do with him. In the end Dexter also kills Lila because of her violent tendencies.
Season 3 saw Dexter finally tying the knot with his long time girlfriend and mother of 2, Rita who was pregnant with their child. Dexter somehow befriended a prominent assistant District Attorney, Miguel Prada. They became so close that he eventually found out about Dexter's after hours hobby and tried killing a man himself just for kicks. Miguel got carried away with his newfound past time and started to kill more people. Dexter decided to stop the monster he helped created by killing Miguel in the end.
In season 4, Dexter, Rita and their 3 children moved to a new neighborhood. Dexter struggles to balance his new role as parent and work. An veteran serial killer called the Trinity killer (because he kills in 3s) showed up in town and Dexter managed to track him down and befriends him. In the end Dexter succeeded in killing the Trinity killer (as always) but comes home one night to find his wife Rita dead in a pool of blood in their bath tub.
Season 5 is currently airing halfway through in the U.S but I'd rather wait till the season finishes before watching them at TV Shack. There's no way any local TV station is going to show Dexter here anytime soon so the only place you can see Dexter is from the Internet. Go on and watch Dexter, I'd highly recommend it. Just don't get carried away with all the killings okay.