Sealy died in 1985 on his 68th birthday. He had been preparing for his classes in the John Jay College Library when he suffered a heart attack.
On December 4, 1991, the library at John Jay was renamed the Lloyd Sealy Library in his honor. The Special Collections there house his personal papers, which document his career as a police officer and a scholar.
^Egan, Nancy (8 August 2007). "The Lloyd Sealy Library of John Jay College of Criminal Justice: Academic Library, Special Library, or Both?". Behavioral & Social Sciences Librarian25 (2): 1–22. doi:10.1300/J103v25n02_01.|accessdate= requires |url= (help)
^"Manuscript Collections". Lloyd Sealy Library Special Collections, John Jay College of Criminal Justice. Retrieved 6 March 2013.