Colonel Gevorg Mheryan, 33, was shot three times in the head and once in the body near the entrance to his 7th floor apartment shortly before 8.30 p.m. (1630 GMT), a police statement said.
Mheryan was an aide to the president on judicial issues before being appointed deputy chief of police in July 2008.
Local media reported that he also previously led a team monitoring efforts to stamp out rampant corruption in the former Soviet republic.
The police statement said the country's prosecutor-general, police chief and security committee head had inspected the crime scene.
"The emergency services established that Mheryan died from bullets to the head and body," the statement said.
"A criminal case has been launched and police are trying to track down the person responsible."
Last Mod: 04 Şubat 2009, 16:52