[1][2][3] After attending Kent State University, Costello worked at Akron, Ohio's WAKR-TV as an award-winning police and court reporter.
She was part of CNN's Peabody-winning coverage of Hurricane Katrina and the 2008 presidential election, and also covered the Virginia Tech massacre, the inauguration of Barack Obama and the Casey Anthony trial.
"[7][8] Paul Bedard called Costello's "rude and crude enjoyment" an easy slap by a prominent female media star on a young woman.
On October 16, 2018, it was announced by HLN that Costello was to be laid off, along with Michaela Pereira and Ashleigh Banfield, as part of the network's decision to scale back their live news programming.
[13] A former resident of Atlanta, Georgia, Costello moved to the New York area after marrying Timothy Law Snyder in 2004.
[citation needed] In October 2015, Snyder was named president of Loyola Marymount University in Los Angeles.
[14] In January 2017, Costello cited her husband's relocation as a primary factor in her decision to leave CNN for HLN and move to Los Angeles.