That was fast ... prosecutors in Los Angeles County say they've charged three men with murder in the fatal shooting of Maria De La Rosa , a singer who went by the stage name DELAROSA .

Los Angeles County District Attorney Nathan Hochman says the alleged killers in the "ambush-style attack" are 27-year-old Francisco Otilio Gaytan , 27-year-old Benny LiconGomez , and 21-year-old Eduardo Lopez ... prosecutors say they are all from Northridge, where the shooting occurred early Saturday morning ... and each has been charged with one felony count of murder and two felony counts of attempted second-degree robbery.

Hochman says the men allegedly approached a parked car shortly before 1:25 AM on Nov. 22 on Bryant Street in Northridge ... they demanded money and then opened fire, k

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