'Pretty Little Liars' Season 4 spoilers: Zack is back, more Sasha Pieterse and 'Dial M for Murder'

Details have been flying online about the first four episodes of "Pretty Little Liars" Season 4. Let's take a look at what we know so far. The above photo is the first official picture released, via TV Guide. It shows new character Detective Holbrook, who works for the Pennsylvania State Police. Actor Sean Faris tells TV Guide that Holbrook and partner Linda Tanner are in Rosewood "to investigate some of the mysteries that seem to elude the local police."Speaking of Det. Tanner, Roma Maffia has been cast in that role and below is a picture director Norman Buckley tweeted from the PLL set. RELATED: PLL Season 4 behind-the-scenes picsWhat else do we know? Well, Buckley has also tweeted the below picture of Steve Talley, which means Ella's love interest Zack is back. Buckley adds on Twitter, "We're doing a scene this morning on #PLL inspired by #DialMForMurder on the very soundstage where #DialMForMurder was shot."...



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