Why is another congressman ABANDONING their elected position effective in May?

http:// www.foxnews.com/politics/2018/04/17/what-charlie-dents-resignation-means-for-his-house-seat.html

This so-called "moderate / centrist (RINO NeverTrumper) announced last fall he would not run for reelection. Today he announces he's leaving in May.

Is their dirt forthcoming in the OIG report implicating him in collusion with the Democrats or what?

From last year:

https:// edition.cnn.com/2017/09/08/politics/charlie-dent-paul-ryan/index.html

HIGHLY suspicious.