The arraignment of a Vancouver man accused of causing a sequence of vehicle crashes that mortally injured a Camas man in December on Interstate 205 has been postponed until Friday.Joshua C. Frahm, 28, appeared in Clark County Superior Court on Wednesday with Vancouver attorney Chuck Buckley Jr., who said he was making a courtesy appearance. Buckley requested that Wednesday’s arraignment hearing be postponed to give Frahm time to finalize hiring an attorney.Frahm is charged with vehicular homicide, vehicular assault, hit-and-run injury and false reporting.Rich Irvine, 63, died Dec. 19 from injuries he sustained when he stopped on the interstate on Dec. 7 to help the victim of a hit-and-run crash. Irvine was then struck by another vehicle.Clark County Senior Deputy Prosecutor Kasey Vu added a charge of vehicular homicide against Frahm on Dec. 22.On the morning of Dec. 7, Irvine pulled his vehicle over to the right shoulder of northbound I-205 near Burton Road, got out of the vehicle and crossed the highway to help a Battle Ground man whose Honda CRV had been rear-ended by a Ford F-150 pickup. The motorist, who was driving the pickup erratically before the crash, fled the scene and later reported his truck as being stolen, according to police. Investigators later identified the motorist as Frahm. While Irvine was on the phone with 911, a Honda Odyssey minivan driven by Fredy Delacruz-Moreno, 41, of Seattle collided with the passenger side of the CRV, which was blocking part of the highway. The impact thrust the CRV into Irvine.