Gary Smith, bottom, was convicted last month of killing fellow Army Ranger Michael McQueen in 2006.

Gary Smith was found guilty of involuntary manslaughter after a 12-day retrial in September.

According to prosecutors, Smith shot fellow Ranger Michael McQueen, 22, in the head. The men had served in Afghanistan together and shared an apartment in Gaithersburg.

Prosecutors said Smith then lied to police in an attempt to cover up the slaying.

Smith’s defense had argued that McQueen shot himself.

In 2008, Smith was found guilty of second-degree murder in McQueen’s death. He was sentenced to 30 years in prison for the murder and five years for using a firearm in a felony. He served nearly four years in prison for that conviction, which was overturned last year.

The maximum sentence for involuntary manslaughter is 10 years.