Dexter could potentially have a spin-off if hints by producer Showtime's entertainment president David Nevins are anything to go by.

Michael C. Hall at Showtime's celebrations of 8 seasons of Dexter held at Milk Studios in L.A.
The series, now in its eighth and final season, follows Dexter Morgan a serial killer with a code of conduct. Dexter, working as a blood splatter analyst for Miami police, is able to kill those who break the code often taking police cases from them and dealing harshly with the perpetrators. After wrapping his victims (or criminals depending on how you view it) in cling film he stabs them through the heart, all the time narrating his bizarre logic.
Continue reading: Showtime Executive Hints 'Dexter' Spin-Off Is A Possibility