Her resignation was submitted on Monday and takes effect on October 1st. The story was originally reported by the Observer and was quickly picked up by the Morning News; however, per http://artsblog.dallasnews.com/2013/09/wrr-gm-sarah-colmark-leaving-oct-1.html, she apparently first found out that the resignation was accepted by reading the News' story (at http://cityhallblog.dallasnews.com/...-than-two-years-after-hiring-current-one.html, which includes links back to various Observer stories).