Summit police and Chicago police are working together on the investigation. They have talked to his ex-girlfriend, who was the last to see Dominguez.
In the meantime, the missing man's family is hoping he'll be found.
The large family of Emmanuel Dominguez is experiencing the pain of not knowing the whereabouts of the 30-year-old.
"If anyone has any information, any little detail would help out," said Lila Vergara, the missing man's sister.
Dominguez, called "Emmy" by his family, was last seen during the early morning hours of November 2.
Investigators say he went to a party at a warehouse near Damen and Walnut in the West Town neighborhood.
That's where he ran into an ex-girlfriend and left with her headed for Bucktown.
Investigators say along the way, he got out the car and that his cell phone last pinged at Division and Halsted.
It wasn't until five days later that family members realized no one had seen him and they launched a search, starting at the warehouse.
"We drove by the area and found his car sitting there almost the whole week," said Jose Dominguez.
Dominguez's family has passed out flyers asking for help.
They say they don't know what could have happened to Emmy, who worked as a bartender at the Dana Hotel.
In the meantime they're keeping up their efforts to find him.
"I just want him back. I just want answers. They whole family wants answers," Vergara said.
Summit Police said they don't suspect foul play. One the next steps is to search the Chicago River, near the site where investigators last zeroed in on Dominguez's cell phone.