A young musician was gunned down in Northridge. Did childhood friends set her up?

Maria De La Rosa, 22, a musician who performed as DELAROSA, was shot to death last month in Northridge.

A search warrant affidavit written by an LAPD homicide detective said De La Rosa was set up by her friends.

The affidavit identifies the suspects as members of the Bryant Street gang who botched what was supposed to be a robbery set up.

Around 1:30 a.m. on a Saturday last month, two masked men approached a black Cadillac Escalade idling outside a Northridge apartment building.

One held a shotgun, the other a handgun. A surveillance system captured the sounds of what happened next: A gang challenge, confusion, a demand for property.

Then six shots and sounds of the Escalade speeding off.

In the passenger seat was Maria De La Rosa, 22, with a gunshot wound to the chest. A musician wh