She was identified as 51-year-old Julia Ray.
Her roommate, Stephen Ross Brainard, 58, (pictured) is suspected of killing her.
Sacramento County Sheriff's deputies believe that Brainard telephoned authorities at 5:30 a.m. to report that he had killed his roommate in their house in the 400 block of Lilac Lane in Rio Linda.
Deputies arrived and set up a perimeter around the home. Nearby residents were evacuated and attempts were made to contact Brainard inside the house.
For the next several hours, deputies tried to convince Brainard to leave the home. SWAT and negotiators were on the scene.
At about 9:50 a.m., Brainard surrendered. A team of deputies then went inside the home and found Ray dead, the victim of multiple gunshot wounds.
Brainard was booked into Sacramento County Jail on Wednesday afternoon on suspicion of homicide.