Here are the steps leading up to the Roger Clemens trial this week. Clemens is accused of lying to Congress three years ago about his use of performance-enhancing drugs.

February 1998

As the Toronto Blue Jays' new strength and conditioning coach, Brian McNamee is introduced to Clemens, who is in his second year in Toronto.

June 1998

According to McNamee's January 2008, deposition to congressional investigators, Clemens asks McNamee for the first time to inject him with steroids. It is allegedly the first of several steroid injections this season.

February 1999

Clemens is traded to the Yankees. McNamee remains under contract with the Blue Jays.

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February 2000

McNamee says he and Clemens are reunited after Clemens successfully lobbied the Yankees' front office to hire McNamee as assistant strength coach. McNamee says Clemens agreed to pay his salary.

Summer 2000

McNamee injected Clemens with steroids and human growth hormone throughout the second half of the baseball season, he told congressional investigators.

August 2001

McNamee injected Clemens with steroids, he told congressional investigators.

May 2007

McNamee says he was contacted by Internal Revenue Service Special Agent Jeff Novitzky to discuss personal checks he wrote to Kirk Radomski, a former Mets clubhouse attendant who had just been convicted of illegally dealing performance-enhancing drugs.

July 13, 2007

Faced with the threat of prosecution, McNamee agrees to meet with Novitzky and former Senator George Mitchell, who was commissioned by MLB to investigate its performance-enhancing drug problem. McNamee is offered immunity from potential distribution charges as long as he tells the truth, according to the Mitchell Report.

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Dec. 13, 2007

The Mitchell Report is released, making public for the first time McNamee's assertion that he injected Clemens with performance-enhancing drugs in 1998, 2000 and 2001.

Dec. 18, 2007

Clemens breaks his silence, saying, "I did not take steroids, human growth hormone or any other banned substances at any time in my baseball career or, in fact, my entire life."

Jan 4, 2008

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Newsday reports McNamee and Clemens speak by phone for first time since release of the Mitchell Report. Clemens' lawyers secretly tape the call and later air it at a news conference

Jan. 6, 2008

Clemens goes on the offensive, appearing on "60 Minutes" and calling McNamee's assertions "ridiculous." He says McNamee injected him with lidocaine and B-12.

Feb. 13, 2008

Sitting just a few feet apart from one another, Clemens and McNamee tell their disputed stories under oath before a congressional hearing. It also is revealed that Andy Pettitte said in an affidavit that Clemens once told him about his own use of performance-enhancing drugs, which Clemens denies.

Feb. 27, 2008

The ranking members of the House Committee on Oversight and Government Reform formally ask the U.S. Department of Justice to investigate whether Clemens committed perjury under oath when he denied any use of illegal drugs.

Aug. 19, 2010

A federal grand jury indicts Clemens on charges that he lied about his use of illegal performance-enhancing drugs before Congress.