UPDATE on La Puente homicide

LA PUENTE -- A teenage boy died at the hospital Saturday after being wounded in a drive-by shooting on Hacienda Boulevard, authorities said.
Ivan Sanchez, 15, of La Puente died at an area hospital shortly after the shooting, Los Angeles County Department of Coroner Lt. Larry Dietz said..
The possibly gang-related shooting occurred about 9:30 p.m. on Maplegrove Street, just west of Hacienda Boulevard, Detective Philip Guzman of the Los Angeles County Sheriff's Homicide Bureau said.
An employee at a nearby business, who asked that her name not be published for fear of retaliation, said she was working when she heard what sounded like two to three gunshots and went outside to look.
"He was walking, and then he fell," she said of the wounded teenager.
The woman added she saw a black car speed away from the area.
While a motive in the shooting was not definitively known Sunday, Guzman said it was likely gang-related.
"It sure looks that way," he said.
Sanchez was walking when he was approached by a dark-colored vehicle, Los Angeles County sheriff's Deputy Derrick Thompson said in a written statement.
"An unknown suspect in the vehicle fired several rounds at the victim, striking him in the upper torso," the statement said.
The teen was shot while walking on Maplegrove Street before ultimately collapsing a short distance away behind a nearby Autozone store, Guzman said.
No further details about the circumstances of the shooting were released.
Employees at the Autozone as well as a nearby restaurant Sunday who were working during the shooting said they did not see or hear anything until authorities arrived.
The only evidence of the shooting that remained at the scene Sunday were several discarded wrappers from alcohol-soaked cleaning pads behind the Autozone, presumably left behind by paramedics.