One week after the shooting death of 52-year-old David Carlson Forest Park Police continue to work on the case, but as of Friday morning the case had not produced any firm suspects.

“We’re developing leads and we continue to run down leads, but none of our leads have led to anything yet,” Forest Park Police Chief James Ryan said Friday. “We continue to work on it and we continue to interview witnesses.”

Carlson was found dead in his garage at 513 Hannah Ave. at around 9 p.m. on Dec. 20 with a single gunshot wound to the head. The bullet was fired from a handgun, said Ryan, and the victim was pronounced dead at Oak Park Hospital.

The Cook County medical examiner’s office has ruled Carlson’s death a homicide.

The next day Forest Park police brought in three suspects for questioning, said Ryan. The two men and a woman were held and questioned for approximately 16 hours on Dec. 21 before they were released. They are no longer considered suspects, Ryan said, and none of those individuals brought in for questioning are Forest Park residents.

The investigation is being led by Detective Sgt. Michael Keating. Ryan said that all three Forest Park detectives and two tactical officers have been working on the case. Officers from the West Suburban Major Crimes Task Force, a law enforcement group that includes a number of west suburban police departments, are also aiding in the investigation.

Approximately 40 to 50 possible witnesses have been questioned by authorities.

“We haven’t ruled anyone out,” Ryan said.

One item from Carlson’s garage was taken, but has been recovered. Ryan declined to identify that item for fear of compromising the investigation.

Ryan said he believes the killing may have occurred as the result of a robbery.

“It just seems like a random act,” Ryan said. “We haven’t determined any specific motivation.”

Police are still waiting for test results on several pieces of physical evidence.

The killing is the first murder in Forest Park since Roberto Munoz of Berwyn was killed in October of 2004 in what police believed to be a gang related slaying.