We’re following this story as it develops. Officers told reporter Tania Chatila that the woman is still not identified. But somehow they know she was 52-years-old:

ALHAMBRA – Authorities are investigating the shooting death of a woman by a California Highway Patrol officer Tuesday night after the woman allegedly brandished a fake handgun.

The incident occurred about 11 p.m. off the 10 Freeway near Hellman and Garfield avenues.

Authorities believe the woman – who has not been identified – pulled out a replica handgun prompting the officer to fire back.

The woman died at the scene, according to reports.

No further details were immediately available.

This from the Associated Press:

ALHAMBRA, Calif. (AP) _ A California Highway Patrol officer has shot and killed a woman during an Alhambra traffic stop after she pulled what turned out to be a replica handgun.

Los Angeles County sheriff’s Deputy Aura Sierra says the shooting just off Interstate 10 east of downtown Los Angeles occurred shortly after 11 p.m. Tuesday.

Sheriff’s investigators remained on the scene Wednesday morning at Hellman and Garfield avenues.

KTLA television says the CHP officer spotted the woman’s red BMW speeding on the freeway and made a traffic stop just off the interstate.

Investigators say the woman pulled out what appeared to be a handgun and the CHP officer, fearing for his life, shot her. Sierra says the woman was declared dead at a nearby hospital.

The woman’s name hasn’t been released.