Mike Adams resigned Tuesday as a precinct committeeman in Bonneville County and no longer will be the county's voting representative on the state GOP central committee.
"It's the right thing to do," said Bonneville County Republican Party Chairman Damond Watkins.
Watkins' brother, Bonneville County prosecuting attorney Dane Watkins Jr., said Adams won't face misdemeanor charges of making a threat against a state official, because his fake certificate sent to state Rep. Ann Rydalch didn't make a specific threat.
Adams has admitted sending Rydalch the certificate. He had challenged Rydalch in the GOP primary, but dropped out of the race a month before the election, citing health problems. Rydalch went on to win the seat.
Two months later, she reported receiving a death threat.
An Idaho State Police investigation found Adams' fingerprints on the certificate.
In a personal column published last week in the Post Register, Adams apologized and said the certificate was meant only as a joke.
Rydalch said she was "scared to death" when the certificate arrived in the mail and suspected it came from Adams.
"What perplexed me was that someone I thought was my friend would do that," she said.
Watkins said the certificate, while clear in its meaning, contained no specific threat against Rydalch. The Idaho attorney general's office reached the same conclusion, he said.