Charity King was found unresponsive and suffering from multiple stab wounds to her upper body nearly a month ago inside an apartment on the 1000 block of Pacific Avenue.
The baby boy, Isaiah Gaston, was found at the Scottish Inns motel at about 7 a.m. on Feb. 9 after police responded to a call of a domestic violence incident.
The DA’s office said Munguia shot Rodriguez in the face “during an argument about who was the owner of a bicycle.”
Police described Brand only as an acquaintance of the boy’s mother, but prosecutors said Brand was the boy’s godfather.
A special circumstances allegation of murder during a robbery could lead to a sentence of life in prison without the possibility of parole if Antonio Lamont Triplett is convicted.
Police said they believe the motive for the killing was domestic violence-related.
Police said the victim initiated a physical altercation.
A man who allegedly shot and killed an acquaintance during an argument in Downey in 2015 has been arrested in Mexico, police said.
A murder charge was filed today against the mother of Trinity Love Jones, whose body was found partially inside a large duffel bag.
Prosecutors will decide later whether to seek the death penalty against the three.