Mark Driscoll, the charismatic but choleric pastor of a once-booming evangelical megachurch based in Seattle, has resigned after the completion of an internal investigation into his conduct, the church’s board announced on Wednesday.

The investigation by a group of elders at the church, Mars Hill, found that Mr. Driscoll “has, at times, been guilty of arrogance, responding to conflict with a quick temper and harsh speech, and leading the staff and elders in a domineering manner.” But the board also declared that some unspecified accusations against Mr. Driscoll were “altogether unfair or untrue” and said that “Pastor Mark has never been charged with any immorality, illegality or heresy.”

Mr. Driscoll submitted his resignation on Tuesday, the church said. He had been on leave since late August while the investigation was being conducted.

“I readily acknowledge I am an imperfect messenger of the gospel of Jesus Christ,” he wrote in his resignation letter. “There are many things I have confessed and repented of, privately and publicly, as you are well aware. Specifically, I have confessed to past pride, anger and a domineering spirit.”