Nader Nilianbousheri, 32, was shot and killed at his residence in the 3900 block of 16th Street S.W. on Nov. 6, 2007.
Police believe he was the victim of a home invasion and got in an altercation with the culprits, which resulted in his death.
Two Ontario men, one from Ottawa, arrested, charged in 2007 Calgary cold case homicide
On Oct. 8, Calgary police arrested two men in connection with the killing with help from police in Ottawa and Toronto.
Mahamed Mohamud Mussa, 42, of Ottawa, and Mohamed Yousuf Mohamed, 43, of Toronto, were each charged with one count of second-degree murder.
"Unsolved homicide investigations remain open and our investigators continue to search for new evidence with the goal of holding people accountable for their crimes," said Staff Sgt. Colin Chisholm.
"We strive to find answers and finality in these cases, like all homicide investigations, and bring justice to victims of homicide."
Anyone with information about this case is asked to call the Calgary Police Service's homicide tip line at 403-428-8877 or to contact Crime Stoppers.
Calgary police thanked the Ottawa Police Service and the Toronto Police Service for their support in the investigation.
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Investigators say he was the victim of a home invasion and was involved in an altercation with the suspects.
Calgary police, assisted by members of the Ottawa and Toronto police departments, arrested two men last week.
Mahamed Mohamud Mussa was arrested in Ottawa, while Mohamed Yousuf Mohamad was taken into custody in Toronto.