One of the people who was killed was Savannah McNealy, a senior student at Colorado State University.
After the ride-share driver left, Jones said, Zamora ambushed the three in the building's parking lot.
The complex is one block from Colorado State and directly across the street from a student housing complex.
Three people are dead, including a Colorado State University student, and another person was injured in an early-morning shooting at the Sunstone Apartments, just northwest of campus.
School staff tell our sister-station, CBS 4 in Denver, that McNealy was out celebrating her birthday with Kemp, Zamora, and other friends before her death.
Air Force officials identified Zamora as a staff sergeant assigned to the Francis E. Warren Air Force Base in Wyoming. Kemp, McNealy and the surviving victim were given a ride to an apartment complex before 2 a.m. on October 19 located one block west of the CSU dormitory towers.
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According to the insider, the Queen normally sits for half an hour eating from a selection of sandwiches, fruit or plain scones and cake.
It was supposed to be a night out celebrating McNealy but the 22-year-old's life was cut short less than two hours after her birthday.
Police say the third victim is hospitalized and expected to survive her wounds. McNealy was set to graduate in December. Zamora killed McNealy and Kemp before taking his own life. Her identify wasn't immediately released. Police confirmed Zamora owned the handgun and two rifles found at the scene.
Kemp's aunt told 9NEWS he was an Air Force veteran working as a civilian contractor for the military.
She worked at Rocky Mountain Student Media Corp., which operates The Rocky Mountain Collegian, an independent newspaper at CSU.
Colorado State was holding a campus vigil for McNealy Friday evening.
"We are deeply saddened by this awful loss to our campus community and will share more information as we have it", the university said in an email to students and staff.