Ian Paul Custer rehearses for Drury Lane Theatre’s revival of the suspense thriller “Dial M for Murder.” The St. Charles native plays Captain Lesgate, a former schoolmate of a frustrated husband who is scheming to kill his wife. Courtesy of Drury Lane Theatre

Around 2008, as he graduated college, actor/musician Ian Paul Custer — who co-stars in Drury Lane Theatre’s “Dial M for Murder” revival — sought representation from a New York talent agent.

One prospective candidate asked the St. Charles native to name his favorite new play. He responded with “August: Osage County,” the Pulitzer Prize- and Tony Award-winning family drama by Steppenwolf Theatre’s Tracy Letts. Asked about his favorite actor, Custer named Chicago veteran Michael Shannon, a founding ensemble member of Chicago’s A Red O

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