His body was left in the restaurant.
The victim's name is Chafic Ezzeddine, but he went by Steve.
Officials are not saying if robbery is a motive.
Dozens of investigators are now working this case.
Authorities are asking for the public's help.
If anyone saw anything Saturday afternoon, please call the Morris County Prosecutor's Office at 973-285-6200, the Roxbury Township Police Department at 973-448-2100, or the Morris County Sheriff's Crimestopper Program at 973-267-2255.