Mary McCormack is about to go out of 'Si...

Mary McCormack is about to go out of 'Si...

USA Network/Cathy Kanavy

Mary McCormack and Frederick Weller on ‘In Plain Sight’

In Plain Sight ends its five-year run on USA Friday (10 p.m.), meaning fans may find out whether Mary Shannon (Mary McCormack) and Marshall Mann (Frederick Weller) will be more than just professional colleagues.

Marys life is way too tangled to think one last episode will straighten it all out, but viewers will get some clues about whether shes making progress.

LINE STAYS OPEN: WBLS (107.5 FM) will pick up the popular Open Line show from the late Kiss-FM, WBLS program director Skip Dillard said Thursday.

Open Line, hosted by Bob Slade, James Mtume and Bob Pickett, is one of the few black public affairs programs on radio. It will stay in its 10 a.m.-noon time slot Sundays, following The Rev. Al Sharpton, 9-10 a.m.

WBLS also will bring in Fred Buggs from WRKS for the 10 a.m.-2 p.m. Saturday shift and Felix Hernandezs Rhythm Revue Sunday, noon-3 p.m.

DOTS ALL: Starz has signed director Michael Bay (Transformers, Bad Boys) for the pirate adventure series Black Sails, to launch with eight episodes in 2014. ... Mick Jagger will host the Saturday Night Live season finale May 19. ... Cat Deeley will host a new celebrity dating show, The Choice, premiering June 7 on Fox. ... The CW has renewed Supernatural, Vampire Diaries and 90210 for the 2012-2013 season. ...

The new Long Island Business Report with Jim Paymar can be seen at 5:30 p.m. Saturday and 10:30 a.m. Sunday on Ch. 21/WLIW. ... Sean (Hollywood) Hamilton has signed a new three-year deal as afternoon host at WKTU (103.5 FM). ... Christine Vitale will pay tribute to the late pioneer rhythm and blues singer Bobby Thomas, who died Thursday, on Sunday, 7-10 p.m., over WFDU (89.1 FM).