Hawaii is grappling with an increase in snorkel-related deaths. Ten people have died since January. A full-face snorkel mask is at the center of one theory about the rise in deadly incidents, with four deaths linked to the gear. Vladimir Duthiers reports. Source

A grieving family is speaking out about the death of their dog aboard a United Airlines flight. They say a flight attendant forced them to put the 10-month-old French bulldog in an overhead bin, and was kept there for the entire three-and-a-half-hour flight. Kris Van Cleave reports. Source

Rex Tillerson’s two top staff members and his State Department deputy are following him out the door. The fired secretary of state says President Trump never spoke to him before revealing his decision on Twitter. Major Garrett reports. Source

Democrat Conor Lamb in the special congressional election in western Pennsylvania is claiming victory over Republican Rick Saccone, but the race is still razor thin. Nancy Cordes reports. Source

Actor Alan Cumming won a Tony Award in 1998 for his performance in the hit Broadway show, “Cabaret.” The many parts he’s taken on during his decades-long career include a James Bond villain, a mutant in “X-Men 2,” and a political operative in “The Good Wife.” Cumming joins “CBS This Morning” to discuss his new CBS drama, “Instinct,” and why he took on the leading role. Source

A school administrator is on leave after a secret recording revealed he suggested sabotaging plans to keep drinking water safe in Nashville area schools. CBS affiliate WTVF has reported on the dangerous lead levels in some of the district’s schools for nearly a year. Anna Werner reports. Source

In what appears to be a heartbreaking coincidence, a second fertility clinic announced it experienced an equipment failure. Hundreds of eggs and embryos may be damaged. CBS News medical contributor Dr. Tara Narula has the details. Source

A photo of a waitress helping an elderly customer cut his food went viral online and her good deed has now earned her a college scholarship. Source

The brackets are set for college basketball’s March Madness tournament where 68 teams will compete for the national championship. CBS Sports columnist Bill Reiter joins CBSN to look at the tournament matchups. Source

British Prime Minister Theresa May, speaking to lawmakers about the poisoning of former Russian double agent Sergei Skripal and his daughter, said it was “highly likely” that Russia was behind the attack. Source