palin, who has urged people not to get vaccinated, has said, it will be over my dead body that i ll have to get a shot. she also reportedly had covid last march. in the meantime, we turn to other news as we were coming on the air tonight, kaylee, the fda pulling back authorization for some treatments when it comes to omicron and covid? reporter: yes, david. the fda confirms that regeneron and eli lilly s therapies are no longer authorized for use in the u.s. because researchers found that they don t work against omicron. there is mon clone nall antibody treatments available and we have those anti-t tviral pills that effective. david? kaylee, thank you. we turn now to the chilling case here in new york city, an officer killed, another fighting for his life. and tonight, new york city s new mayor now launching a mayor crackdown on gun violence. here s abc s phil lipof tonight. reporter: tonight, alarming new details ou