The 35-year-old shot 33-year-old Timothy Mock three times at their home near Consort, Alta., on Feb. 22, 2012.
While he admitted the crime all along, the question was his mental state at the time of the offence.
The defence painted a dark history of mental illness, but the Crown argued there was no proof Mock was suffering from any form of psychosis at the time.
Mock sat stoic in the prisoner's box as the jury rendered its verdict, like he did through much of the nearly three-week long trial.
Second-degree murder carries an automatic life sentence with no chance of parole for at least ten years.
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