Friends and family of a Long Island businessman wounded in a shooting outside Oheka Castle are offering a $100,000 reward for help finding the gunman.

Gary Melius announced the reward in a six-minute video he released to news organizations on Tuesday. Melius was shot a year ago Tuesday outside the elegant hotel and banquet hall in Huntington.

Melius owns the lavish, 127-room mansion. It's been used as a hotel and event hall and as a backdrop for movies and photo shoots.

Police say a masked man accosted the politically connected Melius as he walked to his car and shot him in the head.

Police did not immediately comment Tuesday on the investigation. Sources previously told NBC 4 New York that Melius' son was questioned in the shooting. 

In the video, Melius also criticizes a political opponent and news coverage. The man has publicly suspected political rivals for the shooting. 

The oldest member of the Jonas Brothers, Kevin Jonas, was married at the 109,000-square-foot French-style chateau in 2009. Former President Bill Clinton officiated the wedding of Anthony Weiner, ex- congressman and mayoral candidate, at the castle in 2010.