Segui is scheduled to be interviewed June 16 in Washington by federal agents and assistant U.S. Attorney Daniel Butler, followed by a June 17 appearance before the grand jury. Federal authorities had twice previously asked Segui to voluntarily appear, but Thursday two FBI agents showed up at his suburban Kansas City home with a subpoena requiring his appearance.
As they have with at least one other witness, authorities presumably want to question Segui about steroid-related evidence maintained by Clemens' chief accuser, Brian McNamee. Clemens' former personal trainer has provided the government evidence believed to include bloody gauze, vials and needles that McNamee claims contained steroids and the seven-time Cy Young Award winner's DNA.
McNamee earlier advised authorities that Segui was among those he told at the time about the evidence. He claims he kept the medical waste as protection in case Clemens turned against him.
"[McNamee] first told me back in 2001 or 2002 before all this stuff happened," Segui said Friday. "He just mentioned that he had kept some evidence. I didn't think anything of it at the time because [McNamee and Clemens] were good friends. I don't know anything besides that. I never saw it.
"I just know what Mac told me. I don't know if Roger Clemens ever did steroids or not, and it's none of my business. I barely know Roger Clemens. I just know he was a great pitcher."
McNamee knew Segui through a mutual friend, former steroid supplier Kirk Radomski. Authorities are aware that Radomski also knew McNamee had maintained the evidence, though he apparently wasn't questioned about it when he appeared before the grand jury in 2009. It is possible he may be recalled.
According to the New York Daily News, Wall Street investment manager Anthony Corso was questioned about the decade-old evidence during an April appearance before the grand jury. Corso hired McNamee to train him in 2003, and at about that time it is believed McNamee told him about the blood-stained waste he was hanging onto.
Mike Fish is an investigative reporter for ESPN.