Metro

Ad chief named in Tim Cahill trial

Hill Holliday chief executive officer Mike Sheehan has been named an unindicted co-conspirator in the case against former state treasurer ­Timothy J. Cahill and Cahill’s former campaign manager, Scott Campbell, a prosecutor said in court Monday.

Campbell and Cahill are ­accused of conspiring to use Cahill’s office for an unwarranted privilege: running ads for the Massachusetts State Lottery, allegedly to boost ­Cahill’s electoral hopes during his 2010 run for governor. Hill Holliday was the lottery’s longtime ad agency.

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With the jury out of the courtroom Monday, defense laywers and prosecutors debated the admissibility of e-mails, includ­ing some from Sheehan. Prosecutor James O’Brien said that as the campaign’s alleged conspiracy got underway to direct the lottery’s actions, Sheehan began forwarding e-mails from his Hill Holliday e-mail account to a private account before sending them on to Campbell.

“This case isn’t about Mr. Sheehan,” Judge Christine Roach told O’Brien. “We don’t have Mr. Sheehan before us.”

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To that, O’Brien replied, “No, but he’s an unindicted co-conspirator.”

According to Hill Holliday, Sheehan’s status as an unindicted co-conspirator is simply related to court procedures about introducing evidence during a trial.

“Mike has not received ­immunity,” said Tracy Brady, Hill Holliday spokeswoman. “His designation is related to the rules of evidence that require that status in order for certain statements to be ­entered as evidence in the case.”

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Through an aide, Attorney General Martha Coakley, who brought the case against ­Cahill, declined to comment.

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