Authorities Friday identified the suspect as Zuberi Sharp, a 24-year-old Newbury Park man. Family members identified the 15-year-old victim as Zayde Keohohou, Sharp's brother.
Keohohou's family members gathered Friday evening for a brief public statement, saying in part: "We appreciate the outpouring of love, aloha, support and prayers from friends and ohanas and this wonderful community."
Sharp allegedly attacked his brother inside a Newbury Park home in the 400 block of Jeanne Court Thursday around 8 p.m., according to the Ventura County Sheriff's Office.
Keohohou was found with blunt force trauma to the head, sheriff's officials said. It was not immediately known what weapon was used, but a spokesperson from the Ventura County Sheriff's Department said it was possibly an ax.
Keohohou died on his way to the hospital.
Sharp was later taken into custody on the Newbury Park High School football field, about half a mile away from the home where the attack happened. He was naked at the time of the arrest.
A witness who had to shelter in place told ABC7 there were many students on campus for after-school activities at the time of the arrest. No one was hurt.
William Garcia said he was attending a dance recital at the school when the arrest happened.
"Some of the dancers were in a different room so they were locked down in their room, we were locked down in the back, and then when everything was settled, you know, resumed, then we found out afterward what actually happened," said William Garcia, parent of a Newbury Park High School student.
The motive for the brutal attack remains unknown. The investigation is ongoing.
Detectives are asking the public if anyone has video of the suspect fleeing from the scene and/or prior to being taken into custody, to upload them using this link.
Meanwhile, a GoFundMe account has been set up to help Zayde's family.
Sharp's father is currently serving time in prison for an unrelated murder.
The Ventura County District Attorney's Office confirmed to ABC7 that Zuberi Sharp, 24, is the son of Calvin Sharp, the man convicted of chasing down and killing a 6-year-old boy with a meat cleaver in Newbury Park in 2007.
During that attack, the boy's mother and a neighbor who attempted to intervene suffered serious injuries.
Calvin Sharp asserted an insanity plea but was ultimately found sane by a judge who sentenced him to life without parole, plus two additional life terms in 2012.
Family told Eyewitness News that the brothers have different fathers, and that Sharp is the father of Zuberi. Sharp isn't the father of Keohohou.