The Post Independent reports the verdict against Gustavo Olivo-Tellez was returned Friday night after 11 days of testimony during his trial in Glenwood Springs. A sentencing hearing has been scheduled for April 30.
Prosecutors had sought a first-degree murder conviction.
Second-degree murder carries a maximum sentence of 48 years in prison and a minimum of eight.
Blanca Salas-Jurado was shot four times in an apartment near Spring Valley on Oct. 7, 2016.
Attorneys for Olivo-Tellez did not attempt to prove his innocence, but argued that the defendant was not guilty of first-degree murder because his abuse of multiple substances prevented him from forming deliberative intent for murder.