The "Encyclopedia Brown" creator Donald J. Sobol died Wednesday at age 87.
His son, John Sobol, told Reuters that his father died of natural causes in Miami, Fla.
Native to New York City, Sobol served with the Army Corps of Engineers during World War II, and went on to earn his Bachelor's from Ohio's Oberlin College.
After working as a reporter and moving to Florida, Sobol thought up the now-famous "Encyclopedia Brown: Boy Detective" and "Two-Minute Mystery" series in 1958.
Over the next 49 years, Sobol went on to publish 28 "Encyclopedia Brown" books, which sold millions of copies. The success of the books catapulted Sobol into success as he became a household name among children's books readers. Leroy "Encyclopedia" Brown became a beloved character who solved curious cases of mystery.
A 29th book, "Encyclopedia Brown and the Case of the Soccer Scheme" is scheduled for release in October.
"Thanks to Donald, generations of children have learned to read and solve mysteries alongside Encyclopedia Brown, one of the most iconic characters in children's literature," said president of Penguin Young Readers Group Don Weisberg in a statement, according to People magazine.
Also following the news of Sobol's death, "Encyclopedia Brown" became a trending topic on Twitter where users were posting their grief and respects.
"Aw sad news, loved me some Encyclopedia Brown," wrote Sarah, while Go Green posted, "Terrible news those are great books."
Sports Radio wrote, "I read [e]very encyclopedia brown book as a kid RIP Donald Sobol."
"Encyclopedia Brown was the first literary detective I fell in love with," posted Alicia. "Got me started on a long path."
The literary community suffered another loss on Monday with the death of author Stephen Covey who penned "7 Habits of Highly Successful People."
"Sad day for the book world," wrote Kate. "Stephen Covey and Donald Sobol have both passed away."
Sobol is survived by his wife Rose and son, John.