Update, 8 p.m.:
The senior whose unconscious body was found Oct. 14 on a Napa street was declared brain dead Sunday, according to a report in the .
Ramon Ramirez, 17, was scheduled to be taken off life support Monday night and his organs harvested for donation, 's Capt. Tracey Stuart told the newspaper.
A varsity soccer player, Ramirez was the victim of an unknown collision earlier this month that left him with critical head injuries.
On Monday, the issued an appeal for witnesses:
On October 14, 2011 at about 11:26 PM, the Napa Police Department responded to a in the area of Pear Tree Lane and Villa Lane in the city of Napa.
The 17-year-old (Hispanic male) victim was non-responsive and transported to with life-threatening injures.
A prelimary investigation determined that somehow the victim was thrown onto a SUV that was unoccupied and parked on the roadway at the curb. No witnesses were located that evening.
The Napa Police Department Accident Reconstruction Team responded to the area to investigate this apparent collision. School Resource Officers have interviewed the victim's friends in hopes of establishing a time ine to determine what happened leading up to this incident.
Investigators believe there are more witnesses available or other people who may have additional information about happened.
The investigation is ongoing and witnesses are encouraged to contact Officer Helfrich at (707) 257-9223.
Anyone with additional information can remain anonymous and can text their tip to at 274637.
If the tip leads to an arrest, it can result in a cash reward of up to $1000.
Vintage High soccer players and other students gathered on campus Monday to remember their friend and gate proceeds from Monday night's varsity soccer game would be donated to the Ramirez family, according to the newspaper report.