I know Edie remarried by season 6 I believe...

http://t3.gstatic.com/images?q=tbn:ANd9GcQcqLcsY_JvMlBnuoYVK7LnuHo7p5aWyBAkqBk-Hx8MEYSMUf0L9A

They separated early in S4 and Lou started dating later that season. I'm not sure when the divorce became final, but it was pretty clear he and Edie were done by the end of S4.

Season 4-"The Lou & Edie Story," specifically. :) But they started having problems before then.

Season 4-"The Lou & Edie Story," specifically. :) But they started having problems before then.

That's the episode when the separated, not when they got divorced.