Durham police have revealed the identities of two further suspects in the deaths of two Ontario men who were found in the trunk of a car nearly a year ago.

Harjinder Singh Sandhu, 28, of Brampton, and Puneet Singh Chhina, 26, of Ottawa were found dead inside a rental car that was abandoned in Pickering, Ont., on May 5, 2009.

Sandhu, a truck driver, was facing drug charges at the time of his death. He had been accused of attempting to smuggle 30 kilograms of cocaine across the Windsor border crossing in 2007. But police have not said whether the charges were a factor in his death.

Police said Chhina had never been in trouble with the law prior to his death.

Breaks in the case came slowly, with police initially revealing only that the men had intended to meet someone in the Highway 407 and Kennedy Road area prior to their deaths.

In December, police revealed that the men were shot to death in the Kennedy Road and Sheppard Avenue area, before their killers abandoned their bodies in Pickering.

They have since said the slayings had the markings of an organized crime hit.

In the ensuing months, police have made three arrests in the killings.

The first arrest was John Le, a 38-year-old Markham man who was charged with two counts each of first-degree murder, kidnapping, forcible confinement and using a firearm in the commission of an indictable offence. He was arrested in January.

The following month, 29-year-old Vijay Singh was arrested in British Columbia. He, too, was charged with two counts each of first-degree murder, kidnapping, forcible confinement and using a firearm in the commission of an indictable offence.

On Thursday, police announced that they had arrested 56-year-old Ganesh Singh, the father of Vijay on April 21. The Markham man was charged with a single count of being an accessory after the fact to murder.

Police also announced a Canada-wide warrant has been issued for Zaki Goffur, a 34-year-old Richmond Hill man who is charged with being an accessory after the fact to murder. He is believed to be outside of Canada.

The investigation into the deaths of Sandhu and Chhina also saw a break on April 1, when police announced that they had found a cache of explosives in east-end Toronto that was linked to the case. Investigators did not identify how the explosives were linked to the double-murder case.