Alpine police identified the man as 60-year-old Sung Paik of Union City.
Capt. Michael LaViola tells The Record newspaper that Paik entered the yard where workers were removing a dead tree Sunday afternoon. LaViola says the workers yelled for Paik to move but the tree gave way on its own.
Paik's golfing partner and a physician who was also on the course at Montammy Golf Club performed CPR but Paik was pronounced dead at a hospital.
LaViola called the death accidental although local ordinances bar homeowners from hiring workers for such work on Sundays.