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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.”

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.”

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

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