A Republican lawmaker who resigned abruptly had sent a text message to acquaintances last week apologizing for "anything offensive" that may have been sent from his cellphone.
House Majority leader Jud McMillin of Brookville said Tuesday he was giving up his seat. He said the reason was to focus more time on his family.
The decision comes a week after McMillin texted friends that his cellphone had been stolen in Canada.
He apologized in the text for recent messages they may have received from it.
The Indianapolis Star reported that the apology was regarding a sexually explicit video that was sent from his cell phone during the time it was stolen.
The Associated Press spoke to two people who received the text and obtained a copy of it from one of them. The two requested anonymity because it was a private message.
McMillin did not immediately respond to requests for comment.