Liz Lemon Is Finally Going To Tie The Knot And No, It's Not To Spaceman Mike Dexter. NBC Published That The Tina Fey-portrayed Unlucky-in-love Head Writer Of "TGS" The Fictional Show-within-a-show On 30 Rock, Will Wed Her Sweet-if-hapless Boyfriend Criss Chross, Performed By James Marsden.