This is true, as reported by sources like the AP, PBS, and NYT.
From Reuters: "Kimmel, a comedian who frequently lampoons Trump, said during his nine-minute opening monologue on Monday that allies of Kirk were using his assassination last week to "score political points"... ABC pulled the show after Nexstar, which owns 32 ABC local TV affiliates, said it would stop airing the show following Kimmel's monologue."
Significantly, the article also notes that "ABC has not said that it has fired Kimmel, who did not respond to a request for comment," so the official cause of Kimmel's expulsion is still to be determined.
