In 9/11 he suffered some damage in both ribs and lungs when being hit by a plane's wing. He was strangely medicated but it's side-effects forced him to kill Mallory's granddaughters. His own team gave him to the Boys who killed him but was revived to a zombie state hidden beneath the Seven's headquarters, playing in his own feces. He was replaced by Starlight.
In Other Media
Although Lamplighter has yet to physically appear in the series, photos of him have been shown. Unlike his comic counterpart, he has a black costume with a hood. The Deep claims that he "retired".