Ronny Cox as the Tooth Fairy killer. Sean Patrick Flanery joins the cast in season eight as Jacob Elway, a private investigator who Debra works for. Margo Martindale had a recurring role as Camilla Figg, a records office worker who was close friends with Dexter's adoptive parents. JoBeth Williams portrayed Rita's suspicious mother, Gail Brandon, in four episodes of season two. Anne Ramsay portrayed defense attorney Ellen Wolf, Miguel's nemesis. Valerie Cruz played a recurring role as Miguel's wife, Sylvia. In season six, Billy Brown was cast as transferred-in Detective Mike Anderson to replace Debra after her promotion to lieutenant. Josh Cooke played Louis Greene, a lab tech and Masuka's intern, in seasons six and seven, and Darri Ingolfsson played Oliver Saxon in season eight. The main creative forces behind the series were executive producers Daniel Cerone, Clyde Phillips, and Melissa Rosenberg. Cerone left the show after its second season. Executive producer and showrunner Phillips departed the series, after a record-setting season-four finale, to spend more time with his family; "24" co-executive producer Chip Johannessen took over Phillips' post. Head writer Melissa Rosenberg left after season four, as well. After the conclusion of season five, Chip Johannessen was revealed to be leaving the show after a single run, and Scott Buck would take over as showrunner from season six onward. Although reception to individual seasons has varied, the overall response to "Dexter" has been positive. The first, second, fourth, and seventh seasons received critical acclaim, the third and fifth seasons received generally positive reviews, while the sixth and eighth seasons received mixed to negative reviews. While remarking on some of the show's more formulaic elements (quirky detective, hero with dense workmates, convenient plot contrivances), Tad Friend of "The New Yorker" remarked that when Dexter is struggling to connect with Rita or soliciting advice from his victims, "the show finds its voice." The review aggregator website Metacritic calculated a score of 77 from a possible 100 for season one, based on 27 reviews, making it the third-best reviewed show of the 2006 fall season. This score includes four 100% scores (from the "New York Daily News", "San Francisco Chronicle", "Chicago Sun-Times" and "People Weekly"). Brian Lowry, who had written one of the three poor reviews Metacritic tallied for the show, recanted his negative review in a year-end column for the trade magazine "Variety", after watching the full season.