A man was shot dead surrounded by witnesses in Skidmore, Mo., but no one was ever prosecuted. Now that act of vigilante justice has inspired the play “Kenrex.”

The immigration agency had apparently cut training requirements as a part of its enforcement push over the past year.

In her first public comments on the firing, Ms. Weiss, the CBS News editor in chief, said that the longtime correspondent had “broken” the trust in the newsroom.