After serving in the Marine Corps Reserve, Officer Ashley Guindon was ready to start a new career in law enforcement. But in a tragic turn of events, she was gunned down on her first day on duty during a domestic disturbance call. Jeff Pegues reports. Source

“Face the Nation” achor John Dickerson discusses what some Republicans are trying to do to prevent Donald Trump from becoming the party nominee — which is looking more and more likely. Source

While other nations have limited their use by age group, Denmark has decided to completely abandon use of the Oxford-developed drug. Source

The latest CBS News tracker has Hillary Clinton leading Bernie Sanders by substantial margins in a number of states up for grabs on Super Tuesday. In response, Clinton has turned her attention from the race for the Democratic nomination to the upcoming battle with the Republicans. Nancy Cordes has more. Source

David Duke, the former leader of the Ku Klux Klan, praised Republican front-runner Donald Trump last week. Trump’s response has seemingly wavered since then, leading to condemnation from many in the party. Dean Reynolds reports. Source

A photographer was slammed to the ground by a member of Donald Trump’s security detail at a campaign rally on Monday. The incident took place after protesters interrupted Trump during a speech. Major Garrett has more on Trump and the rest of the Republicans on the eve of Super Tuesday. Source

Country Star Kane Brown joins “CBS This Morning” to discuss his ACM nominations and what it will be like to hit the road for his new tour this fall after spending the past year at home with his wife and daughter. Source

The Academy Awards turned out to be a platform not just for racial representation in the movies, led by host Chris Rock’s incisive insight and parody, but a wide array of causes, from global warming and bank reform to sexual abuse in church and on campus. With more on the powerful night of activism at the Oscars, Entertainment Tonight’s Kevin Frazier joins CBSN. Source

Actors Olivia Wilde and Jason Sudeikis talk to CBS News on the red carpet about the Academy Awards experience. Source

Oscar-winning actor J.K. Simmons speaks to CBS News about diversity and presenting at the Academy Awards. He addressed the issues in an interview with CBS News Carter Evans on the Oscars Red Carpet. Source