Albert Trejo, 49, has been charged with killing his girlfriend, Cecelia Zamora, 36.
Authorities believe that she was killed on Feb. 13 in San Bruno. Her body was discovered at an apartment complex in Pacifica on April 26.
Chief Deputy District Attorney Karen Guidotti told the San Mateo County Times that Trejo has delayed entering a plea.
Trejo faces up to life in prison if convicted.