Who plays Hallie's mother in 'Slender Man' (2018) ? - Jessica Blank
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'Slender Man' Movie 2018: Meet The Cast

9. Who plays Hallie's mother in 'Slender Man' (2018) ? - Jessica Blank
Hallie's mother is played by American actress, writer, and director Jessica Blank. You may recognise the actress from 'Elementary', 'Good Medicine' and 'The Mentalist'. Photo via Getty/Robin Marchant]