Casey Sherman (born January 19, 1969) is an American true crime author and journalist.
Sherman was born in Hyannis, Massachusetts. His mother, Diane Sullivan Sherman, was the sister of Mary Sullivan, who was believed to be the final victim of the Boston Strangler. Sherman attended Barnstable High School and graduated from Fryeburg Academy in 1988. He then attended Boston University, graduating in 1998. As a television news producer for WBZ-TV, Sherman led a high profile re-investigation of his aunt's murder, which he later chronicled in his 2003 book, A Rose for Mary: The Hunt for the Real Boston Strangler.
In the case of Mary Sullivan, murdered January 4, 1964 at age 19, DNA other forensic evidence were used by Sherman to try to track down her presumed real killer. Sherman wrote about this in his book and stated that Albert DeSalvo was not responsible for her death. For example, DeSalvo confessed to sexually penetrating Sullivan, yet the forensic investigation revealed no evidence of sexual activity.  However, on July 11, 2013, the Boston Police Department released information stating that they had discovered DNA evidence linking DeSalvo to the murder of Mary Sullivan 
Sherman is a contributing writer for Boston Magazine, Boston Common, The Huffington Post, and the Open Case.com.
- A Rose for Mary: The Hunt for the Real Boston Strangler (2003)
- Black Irish (2007)
- Black Dragon (2008)
- Bad Blood: Freedom and Death in the White Mountains (2009)
- The Finest Hours: The True Story Behind the US Coast Guard's Most Daring Rescue (2009)
- Animal: The Bloody Rise and Fall of the Mob's Most Feared Assassin (2013)
- Emmy Award (nominated)
- 2010 Truth & Justice Award
- 2010 Massachusetts Book of the Year finalist (for The Finest Hours))
- The Boston Strangler 48 Hours Mystery, February 15, 2001. CBS News Recent DNA Test Fails to Identify Boston Strangler, December 7, 2007
- 1. Lauren Beckham Falcone, Time Spent with Finest Hours Writer Casey Sherman The Boston Herald, June 16, 2009
- 2. Laura Raposa There Will Be Bad Blood The Boston Herald, April 4, 2010
- "Hunting the Killer", Thomas Fields-Meyer People, November 27, 2000, Vol. 54, No. 22