News and Press Releases

Heroin Trafficker Sentenced to Lengthy Federal Prison Term

June 29, 2012

Defendants Primarily Distributed Black Tar Heroin in the Mid-Cities Area of the Metroplex

FORT WORTH, Texas — William Walter Rainey, the last of ten defendants to be sentenced for his role in a heroin trafficking conspiracy, was sentenced today by U.S. District Judge John McBryde to 360 months in federal prison, announced U.S. Attorney Sarah R. Saldaña of the Northern District of Texas. The other nine defendants in the case were sentenced to federal prison terms ranging from 75 to 480 months, following their guilty pleas to their respective roles in the conspiracy.

Defendants sentenced are:

  • Mario Guerra-Rocha, 340 months
  • Agusten Diaz, aka “Popeye,” 480 months
  • Michael Diaz, aka “Darky,” 108 months
  • Manuel Parada, aka “Pelon,” 79 months
  • Matthew Christopher Talamini, 110 months
  • Christopher Paul Sibley, 108 months
  • Mark Andrew Talamini, 312 months
  • Timothy Joseph Metzler, 75 months
  • John David Talamini, 135 months

The investigation began in May 2011 when the Tarrant County Narcotics Unit, Northeast Sector, arrested Mark Talamini for possessing two ounces of black tar heroin. Following this arrest, investigators with local and federal agencies worked together to identify his drug associates and his heroin supplier, Mario Guerra-Rocha. The investigation further revealed that Augusten Diaz supplied the heroin to Mario Guerra-Rocha and William Walter Rainey, who each in turn supplied the heroin to others. Investigators learned that all of the defendants were part of a larger organization responsible for distributing heroin in the Mid-Cities area of the Dallas-Fort Worth metroplex.

The investigation was conducted by the Drug Enforcement Administration, the Tarrant County Narcotics Unit, and the Bedford, Euless, Grapevine, Haltom City, Hurst, North Richland Hills and Watauga Police Departments.

The case was prosecuted by Assistant U.S. Attorney Shawn Smith.











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