Sunnie Lane, calf still bandaged where the bullet went in, spoke with FOX40 next to the spot where 17-year-old Jordan Pennell was gunned down.
Another victim injured in the gunfire, a 19-year-old man, is still in the hospital.
"I tried but there was nothing I could do," Lane said. "We all tried."
Police have identified the suspect as 18-year-old Kejhonne Henderson. He was arrested Saturday afternoon on charges of murder, attempted murder and assault with a deadly weapon.
"He just stood there so confidently," said one resident, recalling Henderson's demeanor.
Gunfire rang out after some partygoers say Henderson got in an argument with a girl attendee about what music was on the stereo.
Pennell asked him to go outside.
"He just, he was walking first, the little boy," the Greenholme Drive neighbor said. "And that guy towered over him, was walking right behind him and just shot him close range. And the little boy fell instantly right after that and he just kept letting it in him."
The 17-year-old hung out in the neighborhood and had lots of friends. But as far as they could tell, he didn't have a home.
"Never started trouble. Very soft spoken kid," the neighbor said. "Funny. Cute as heck."
In the spot where he died, neighbors have placed candles, flowers and remembrances.
Henderson is now at the Sacramento County Main Jail and will be in court Tuesday.