NEWTON — A 53-year-old man was found dead in a parking lot behind a pizzeria early Saturday morning, Sussex County authorities said.

First Assistant Prosecutor Greg Mueller said the prosecutor's office and Newton Police Department are working to determine the events leading up to the death of Thomas Thum.

A delivery man discovered Thum's body around 6:30 a.m. outside Newton Pizza on Sparta Avenue, Mueller said.

A cause of death is pending the outcome of an autopsy by the county's medical examiner, the assistant prosecutor said.

In a post on its Facebook page, the Newton Police Department said there's no threat to the public.

Additional information about the incident was not disclosed Saturday evening.

Kimberly Redmond may be reached at kredmond@njadvancemedia.com. Follow her on Twitter @kr0618. Find NJ.com on Facebook.