Sgt. Steve Martos says 27-year-old James Calderon was booked Saturday afternoon in the killing of Bria Helpley.
Martos says Calderon's 46-year-old mother, Sandra Calderon, has been arrested for hindering prosecution and for allegedly attempting to destroy evidence.
Police say Helpley and James Calderon got into some kind of altercation near Monroe and 14th streets just before 7 a.m. Saturday.
Martos did not say the manner in which Helpley was killed.
Police say James Calderon fled the scene and officers stopped his mother from getting rid of evidence.