REFILE-Key figures in Roger Clemens perjury trial

July 6 (Reuters) - Baseball legend Roger Clemens goes on trial on Wednesday on charges that he lied to Congress and obstructed an investigation into whether he
 took performance-enhancing drugs like steroids and human growth hormones, allegations he has denied.
Following are key figures in the upcoming trial.
* Roger Clemens: Spent 24 years in baseball pitching for four teams, including the storied Boston Red Sox and New York Yankees franchises. He won the Cy Young Award seven times for being the league’s best pitcher. He was picked 11 times for the annual All-Star game and was one of a handful of players to strike out more than 4,000 batters. He has denied publicly ever taking drugs to boost his performance, saying that his trainer injected him with vitamin B12 and the pain reliever lidocaine. Clemens retired at 45, unusually late for a pitcher.
* Brian McNamee: Once a baseball player at St. John’s University and a New York City police officer, he became a strength and conditioning coach for the Toronto Blue Jays in 1998 while Clemens played there. He eventually followed him to the New York Yankees. McNamee told independent investigators for Major League Baseball that Clemens asked him to inject him with steroids in 1998, 2000 and 2001 and in 2000 with human growth hormones. He has admitted publicly that he lied previously when denied giving Clemens and others such drugs. He also denied Clemens’ assertion that he injected him with B12 and lidocaine.
* Kirk Radomski: A former employee in the New York Mets clubhouse, he was a source for illegal performance enhancing substances, including steroids and human growth hormones. McNamee told investigators he obtained the drugs he injected into Clemens from Radomski, who also taught him how to do the human growth hormone injections. Radomski pleaded guilty in 2007 to distributing a controlled substance and money laundering and was sentenced to five years of probation.
* Andy Pettitte: A pitcher for the New York Yankees and the Houston Astros, he was a longtime friend of Clemens and used McNamee as his personal trainer too. He has admitted using human growth hormones in 2002 and 2004. He also testified to a congressional committee that Clemens told him in 1999 or 2000 that he had used human growth hormones and then again in 2005. Clemens has said that while Pettitte was a close friend, he “misremembers” the conversations.
* U.S. District Judge Reggie Walton: He was appointed to the federal bench by President George W. Bush in 2001. He comes from the same hometown in Pennsylvania as baseball superstars Stan Musial and Ken Griffey Sr. He presided over the perjury trial involving Lewis “Scooter” Libby, who was Vice President Dick Cheney’s former chief of staff. Walton also served as the associate director of the Office of National Drug Control Policy between 1989 and 1991 during President George H.W. Bush’s presidency.
* Rusty Hardin: The head of Clemens legal team once was a captain in the Army in Vietnam. He was a local prosecutor in Houston for more than 15 years and then moved to open his own private practice and also worked on the Whitewater investigation. His clients have included the Arthur Andersen accounting firm during the Enron fraud scandal as well as other sports figures, including professional basketball star Scottie Pippen and baseball infielder Wade Boggs.