Casting for Scott Frank’s A Walk Among the Tombstones continues to fill out around star Liam Neeson.  The adaptation of the Lawrence Block novel recently added Dan Stevens (Downton Abbey); we can now report that Ruth Wilson (Luther) and Boyd Holbrook (Milk) will also be joining the cast.  The story centers on private investigator Matthew Scudder (Neeson) who is hired by a drug lord in order to find out who kidnapped him and murdered his wife.  Hit the jump for more on A Walk Among the Tombstones.

Director D.J. Caruso (I Am Number Four) is in talks to direct an adaptation of the Lawrence Frank book A Walk Among the Tombstones for Cross Creek Pictures. Centering on the character Matthew Scudder, A Walk Among the Tombstones sees the alcoholic ex-cop investigating the kidnapping of a heroin drug lord’s wife. If Caruso’s negotiations go through, it isn’t clear whether Tombstones or the John August-penned adaptation of Garth Ennis and Steve Dillon’s Preacher will be his next project.

Deadline reports that Scott Frank (Minority Report) will pen the adaptation which has been rolling around Hollywood for some time now and is expected to take on an “R-rated tone.” A nearly two-decades younger Harrison Ford was once interested in making a turn as the protagonist Matthew Scudder when the pic was set up at Universal. There is no word on who might be interested in starring in the project’s most recent development attempt, but given that Scudder’s character is retired, I’m going to go ahead and say that the 69-year-old Ford should still give it a shot. For more, hit the jump to check out a synopsis for Frank’s book.