Quiet, please." It's a common enough request on the set of a television show. Usually, however, it booms out from a disembodied off-camera voice, not the star.
But Vincent D'Onofrio, 45, who plays Robert Goren, the implacable know-it-all detective on NBC's Sunday-night series "Law & Order: Criminal Intent," is not inhibited by television production etiquette. Ready to rehearse a scene being shot in a kitchen of the Waldorf-Astoria hotel this week, Mr. D'Onofrio, a Brooklyn native, quieted the crew with the gently intimidating authority one might expect of a former nightclub bouncer.
He was similarly assertive as the production continued: Working opposite Chris Penn, a guest star who was playing a celebrity chef, Mr. D'Onofrio overrode the production team's kibitzing on how Mr. Penn should handle a knife ("Let Chris do what he wants to do"), called for rethinking a bit of business with a plate ("It would be nice for him actually to have something to do. Let's figure it out."), and announced when the scene had been sufficiently rehearsed ("All right. Let's shoot.").
"I like to stick my nose in everybody's business," Mr D'Onofrio said during a break in a Waldorf reception room, explaining both his own boundary-blurring approach to filming and his affinity for Orson Welles, who also was hardly a production wallflower.
Mr. D'Onofrio portrayed Welles in the movie "Ed Wood" in 1994, and last summer began working on a short film about Welles, which will feature the actor as co-producer (with his business partner, Ken Christmas), director and star.
The film, based on an event taken from Welles's life, is the sort of demonstration tape that Hollywood often requires of actors aspiring to direct feature films. It is also the sort of demanding project that can dismay their bosses - particularly when the moonlighting contributes to the performer's being hospitalized with exhaustion, as Mr. D'Onofrio was, twice, last month. Dick Wolf, the creator of the "Law & Order" franchise, said he was "not thrilled" to learn earlier this year that the linchpin of "Criminal Intent" was spending the hiatus after the show's third season working on the Welles film. "You really need all of the strength you can get in the down time," Mr. Wolf said.
Two other factors made Mr. D'Onofrio a candidate for fainting episodes that landed him in the hospital. One is the workload he carries. Hourlong television drama series are so notorious for their 14-hour days that lead actors sometimes have contracts stipulating that they will appear in a maximum of about 14 scenes per episode; Mr. D'Onofrio, a movie character actor with little television experience before signing up for "Criminal Intent," does not have that contract provision. While "Law & Order" and "Law & Order: Special Victims Unit" spread the work among an ensemble of actors, "Criminal Intent" leans more toward the traditional single-protagonist formula.
Mr. D'Onofrio and his co-star, Kathryn Erbe, who plays his partner, Detective Alexandra Eames, appear in about 28 to 30 scenes per episode, the show's executive producer, Rene Balcer, said, adding that "Vincent has a huge number of lines."
The other factor was a simple matter of personality. "To say that Vincent is hands-on would be an understatement," Mr. Wolf said.
The producer could imagine the amount of work that Mr. D'Onofrio was putting into editing and finishing the Welles project at night after long days filming this fall, he said, but "I didn't want to know."
When Mr. D'Onofrio was hospitalized and his health status unclear while tests were being run, Mr. Wolf confronted the possibility of having to change lead actors at a time when the show was being sold into syndication to the Bravo and USA cable channels for a record $1.92 million an episode. (Both cable channels are owned by NBC Universal Inc.)
Replacing Mr. D'Onofrio was "a frightening prospect," Mr. Wolf said, because it would have meant tampering with the mysterious chemistry that bonds a show with a large audience. Nonetheless, he made a list of candidates, "as anybody in their right mind would have." One of the possibilities included actor Chris Noth, who was a "Law & Order" regular in the early 1990's and was scheduled to be a "Criminal Intent" guest star in January.