Quickly catch up on the day's news

(CNN)Here's what you might have missed Tuesday on CNN:

-- Retired Supreme Court Justice Sandra Day O'Connor, 88, revealed in a letter that she has been diagnosed with the "beginning stages of dementia, probably Alzheimer's disease." In a letter written from Phoenix, she explained that she will no longer participate in public life.
-- Jamal Khashoggi died as a result of a brutal premeditated murder, Turkey's President Recep Tayyip Erdogan said in a highly anticipated speech. He soundly rejected Saudi Arabia's claim the journalist was killed accidentally. Here's what he did and didn't say.
-- An oil spill you've never heard of could become one of the biggest environmental disasters in the United States. The Department of Justice submitted an independent study into the nature and volume of the spill that claims previous evaluations of the damage significantly underestimated the amount of oil being let loose.
    -- Austin, Texas, could run out of water if residents aren't careful. Officials are urging residents of the Texas capital city to cut water consumption by at least 15% so water treatment plants can catch up with demand as historic flooding continues to muck up lakes that supply the region's tap water.
    -- We already know Hurricane Willa will hit Mexico hard this week. But here are three ways Hurricane Willa could wreak havoc from Texas to New England.
    -- UK police have identified a passenger who was filmed racially abusing an elderly woman on a European flight. The viral video shows the man threatening to push 77-year-old Delsie Gayle from her seat and saying: "Don't speak to me in a foreign language, you stupid ugly cow."
      -- Veggie burgers may not be the healthiest options -- at least if you're trying to limit your sodium intake. Meat-free burgers contain high levels of salt -- exceeding recommended limits, finds a new survey into the salt content of vegetarian and vegan alternatives to meat.
      -- Mariah Carey is coming to a television screen near you. This time it's as an adviser on season 15 of NBC's "The Voice."