The crash occurred at about 10:20 p.m. Saturday on Candlewood Lake Road near Huckleberry Hill Elementary School in Brookfield, police said.
It involved two cars and one motorcycle, said police, who have released few details about the crash.
Related story: Motorcyclist Killed In Three-Vehicle Crash In Brookfield
Arnold, of North Pleasant Rise, was taken to Danbury Hospital, where he died, police said.
Danbury resident Richard Dasilva, who was in one of the cars, was also taken to Danbury Hospital with non-life-threatening injuries, according to the News-Times.
Arnold had recently retired and was selling his home and moving out of state, according to the News-Times.
Anyone with information about the crash is asked to contact Brookfield police Cpl. Kevin Brooks at 203-775-2575.
Click here for the story at the News-Times website.
Click here to follow Daily Voice Mahopac and receive free news updates.