More evidence connected with the gun allegedly used in the murder of Nadia Gehl was presented at the trial of three men in a Hamilton court on Monday.

The gun, which the Crown says is the murder weapon, was reportedly discovered in the home of suspect Nashat Qahwash six months after the shooting.

Jurors were told the gun and a loaded magazine were found wrapped up in the ceiling of a basement closet of the Kitchener home where he was living.

Qahwash, along with Gehl's husband Ronald Cyr and Zdenek Zvolensky each face a first degree murder charge in the case. All have pleaded not guilty.

Earlier in the trial the jury was told forensic officers found Qahwash's fingerprints on the packaging around the gun and Zvolensky's DNA on the gun grip.

A DNA expert from Ontario's Centre of Forensic Sciences says the DNA on the grip of the gun, likely skin cells, were matched to Zvolensky's profile.

However, Delmar Doucette, Zvolensky's defence lawyer, asked how and when his client's DNA might have been transferred to the weapon.

The expert told the court there was nothing to rule out Zvolensky having handled the gun in the days before or after the shooting.

There was also other human DNA on the gun but testing couldn't match it.

In addition, the expert agreed with Doucette that there was no DNA evidence that Zvolensky was the person holding the gun at the time of the shooting.

If the person who shot Gehl was wearing gloves at the time of the shooting, the expert admitted it would have prevented the transfer of DNA to the gun.

Gehl was shot at close range in the head and chest in February 2009 while on her way to catch a bus to go to work.

Three cartridge casings were found at the scene of the shooting.

More evidence is expected throughout the week.