Dave Arneson, one of the co-creators of the fantasy game Dungeons and Dragons, died after a two-year battle with cancer. He was 61.
Arneson's daughter says he died peacefully Tuesday night in hospice care in St. Paul, Minn.
Arneson and Gary Gygax developed Dungeons & Dragons in 1974 using medieval characters and mythical creatures.
The game known for its oddly shaped dice became a hit, particularly among teenage boys. It eventually was turned into video games, books and movies.
Gygax died in March 2008.
Malia Weinhagen of Maplewood, Arneson's daughter, says her father wanted people to have fun in life.
A public memorial service will be held April 20.