Their bodies were found in a home in the 5000 block of Jenifer Avenue about 5:20 p.m.
Deputies learned that the person who called them had been called by Gamboa.
Authorities said Gamboa apologized for what he had done and requested that law enforcement be contacted, then apparently shot himself in the head.
A man at the home reportedly called an acquaintance, apologized for what he had done, then requested authorities be contacted.
The motive for the shooting is not yet known.
City News Service contributed to this report.