Police Kill Armed South SF Teen
South San Francisco Police Department says it will conduct a full investigation.
Jodi Hernandez
Derrick, his mom and aunt
An armed teenager was fatally shot by an officer in South San Francisco Tuesday night, according to police.
Officers stopped two pedestrians about 9 p.m. near the 2300 block of Westborough Boulevard when one of the officers saw the man had a gun, according to police reports.
One of the officers shot 15-year-old Derrick Gaines and then began to administer First Aid.
Gaines was taken to a local hospital where he was pronounced dead. 
The officers reported that they initially stopped the two teenagers because they saw them acting in a "suspicious manner."
South San Francisco Police Department Chief Mike Massoni expressed his condolences over Gaines death.
Captain Mike Brosnan said the department will conduct a "transparent investigation" into the "tragic event."
The city's last officer-involved-shooting was more than 30 years ago in 1981.
