CBS brought the tumultuous weeklong crisis over racially insensitive remarks by the radio host Don Imus to an end late this afternoon when it canceled the “Imus in the Morning” program, effective immediately.

The move came one day after MSNBC, which has simulcast Mr. Imus’s radio program for the past 10 years, removed the show from the cable network’s morning lineup. The two moves together mean that Mr. Imus, who has been broadcasting his program for more than 30 years, no longer has a home on either national radio or television.

Mr. Imus received the news in a telephone call to his home. Many of his listeners learned of it during the afternoon radio show “Mike and the Mad Dog,” which announced it on WFAN, the same New York station owned by CBS that carried Mr. Imus’s program.

The CBS chairman, Leslie Moonves, held a meeting this afternoon with the Rev. Al Sharpton, one of the leaders in what became a national movement to have Mr. Imus removed from the air in the wake of comments in which he disparaged members of the Rutgers University women’s basketball team. On his program of April 4, Mr. Imus referred to the women on the team as “nappy-headed hos.”