A popular Brooklyn car salesman was lured to his death after he went to Coney Island for a date with a woman he met online, cops said.

Daniel Brandt, 24, who worked at an Infiniti auto dealership, thought he was going to meet the new girlfriend at the Sea Rise apartment complex there.

Instead, he was confronted by two armed men around 1 a.m., police said.

"He had been in a conversation with a woman and he was going to meet her," a police source said. "He thought he was hooking up with the female."

The source said Brandt was lured up to the fourth floor of the tower, where the gunmen robbed him of his cash and other property then shot him once in the head.

Medics rushed the victim to Coney Island Hospital but he could not be saved, police said.

"I just want to know who killed my son and why," said heartbroken mom, Courtney Brandt, 41. "He's the sweetest man you'll ever know."

"He was all I had," added his grandmother, Corrine Brandt, 87, at the Williamsburg apartment she shared with him. "It just won't be the same."

Police sources said investigators are still trying to determine whether Brandt was set up by the mystery woman or if he was the unlucky victim of a pair of opportunistic attackers.

Cops were hunting for the killers and the woman, but no arrests had been made.

"He was very trustworthy, and that's what got him killed," said Kim Fuller, 49, a family friend.

Until recently, Brandt had been a salesman at Infiniti of Manhattan but had moved on to another dealership selling the high-end vehicles, a friend said.

On his MySpace.com page, Brandt also described himself as a party promoter and part-time model.