“Odd Thomas” star Addison Timlin is in negotiations to join the cast of Lionsgate’s action-comedy “Stand Up Guys,” which Sidney Kimmel Entertainment and Lakeshore Entertainment are producing.Fisher Stevens is directing the film, which stars Al Pacino, Christopher Walken and Alan Arkin. Originally written on spec by Noah Haidle, project was formerly known as “Old Timers.” Story follows two former hitmen in their twilight years who decide to spend one last night of debauchery together before one has to kill the other. Timlin is in talks to play Walken’s granddaughter, one of two key female roles. Sidney Kimmel, Gary Lucchesi, Tom Rosenberg and SKE’s Jim Tauber are producing, while Matt Berenson and the late Bingham Ray will be credited as exec producers. Production is skedded to start next month in Los Angeles, and Lakeshore Intl. and Sierra Pictures will handle foreign sales. Timlin, who just landed the co-lead in the ABC pilot “Zero Hour,” previously appeared on Showtime’s “Californication” and ABC’s “Cashmere Mafia.” Thesp’s feature credits include “Afterschool” and “Derailed,” and she next stars opposite Anton Yelchin in Stephen Sommers’ adaptation of Dean Koontz’s novel “Odd Thomas.” Timlin is repped by Gersh, Management 360 and attorney Ira Schreck.