Federal prosecutors who indicted Milberg Weiss Bershad & Schulman last month are in talks with a Denver lawyer whose testimony could sharpen the investigation’s focus toward Melvyn Weiss, founding partner of the New York-based law firm, according to sources familiar with the government’s probe.

Last month, a federal grand jury in Los Angeles returned an indictment against Milberg Weiss and two of its partners, David Bershad and Steven Schulman, alleging that they obtained $216.1 million in attorney fees by paying $11.3 million in secret and illegal kickbacks to three individuals who served as lead plaintiffs in their cases. USA v. Lazar, No. 05cr00587 (C.D. Calif.).