Boiler Room is a 2000 American crime drama film written and directed by Ben Younger and starring Giovanni Ribisi, Vin Diesel, Nia Long, Ben Affleck, Nicky Katt, Scott Caan, Tom Everett Scott, Ron Rifkin and Jamie Kennedy. From Wikipedia
Katt's death was officially confirmed by his attorney, though no cause of death has been disclosed, as tributes pour in for the versatile performer.
