But when the witness pans the camera to the right, he discovers in horror that a second person has been hit, as Estrada's lifeless body is seen face-down on the sidewalk, her friend desperately tugging at her and calling her name.
On Sunday, LAPD confirmed Los Angeles County Sheriff's Deputieshad arrested 33-year-old Ramon Roque Monreal, from El Paso Texas, after receiving an unrelated call at 3:45 a.m. the following morning.
They found him in Carson, 25 miles from the scene of the shooting, in possession of a firearm, where he was arrested for the Hollywood murder.
His bail was set at $3million. He is due in court on Wednesday.
The other man who was shot, 30, checked into hospital later that night with serious injuries, but is expected to survive.
A GoFundMe set up by a family member to raise money for Estrada's burial has already raised $24k.
"Ale was only 17 and was barley getting her life started. She was one of a kind and the life of the party," it reads. "She was at the wrong place at the wrong time and unfortunately it cost her her life."