Story highlights One man has been arrested, another is making arrangements to surrender

Authorities say a part from the 2005 Porsche Carrera GT was stolen

It was taken off the back of a tow truck that was hauling away the burnt wreckage

Paul Walker died when the sports car he was riding in crashed and caught on fire

Los Angeles Authorities have arrested a man accused of swiping a piece of the wrecked sports car that "Fast & Furious" star Paul Walker was riding in when he died in a fiery crash Saturday.

The theft occurred at a stop light as the charred 2005 Porsche Carrera GT was being removed from the accident scene on a flatbed tow truck late Saturday, according to the Los Angeles Sheriff's Department.

"A witness saw a male exit a vehicle that was following the tow truck," the sheriff's department said Friday. "The male grabbed a piece of the wrecked Porsche off the tow truck bed."

Authorities later arrested 18-year-old Jameson Witty in Tujunga, California. A red T-top roof panel was recovered from a residence in Canyon Country. Both are in the Santa Clarita area, where the accident happened.

A second suspect has also been identified and is making arrangements to surrender himself, the sheriff's department said.

Photos: Paul Walker: Life in the fast lane Photos: Paul Walker: Life in the fast lane Paul Walker, a star of the "Fast & Furious" movie franchise, died in a car crash on November 30, 2013. He was 40. Here's a look at his career through the years. Hide Caption 1 of 15 Photos: Paul Walker: Life in the fast lane Walker with Tyrese Gibson, Michelle Rodriguez and Ludacris in "Furious 7," which had mostly completed filming when Walker died. Many fans got emotional upon seeing Walker onscreen in the movie, which earned $143 million its first weekend. Hide Caption 2 of 15 Photos: Paul Walker: Life in the fast lane Walker's role as Brian O'Conner in the "Fast & Furious" franchise (here with Vin Diesel in the sixth film) helped make the actor a star. Hide Caption 3 of 15 Photos: Paul Walker: Life in the fast lane Walker and Jordana Brewster -- who played his love interest, Mia, in the films -- in "Fast 5." Hide Caption 4 of 15 Photos: Paul Walker: Life in the fast lane Kevin Rankin and Walker appear in "Pawn Shop Chronicles," a 2013 film about a missing wedding ring that sets off a wild goose chase. Hide Caption 5 of 15 Photos: Paul Walker: Life in the fast lane Walker also had a starring role in the 2013 film "Hours," about a man trying to keep his daughter alive after Hurricane Katrina. Hide Caption 6 of 15 Photos: Paul Walker: Life in the fast lane The actor was part of a band of thieves in the 2010 movie "Takers." Hide Caption 7 of 15 Photos: Paul Walker: Life in the fast lane Brooklynn Proulx and Walker in the 2008 film "The Lazarus Project." Hide Caption 8 of 15 Photos: Paul Walker: Life in the fast lane Walker, left, and Barry Pepper were U.S. Marines in the 2006 drama "Flags of Our Fathers." Hide Caption 9 of 15 Photos: Paul Walker: Life in the fast lane Walker appears in the 2005 action film "Into the Blue," which also starred Jessica Alba. Hide Caption 10 of 15 Photos: Paul Walker: Life in the fast lane Tyrese Gibson took over for Diesel opposite Walker in 2003's "2 Fast 2 Furious." Hide Caption 11 of 15 Photos: Paul Walker: Life in the fast lane Walker appeared in 2001's "The Fast and the Furious," the first movie in the franchise. Hide Caption 12 of 15 Photos: Paul Walker: Life in the fast lane Walker, center, appeared in "Skulls" with Leslie Bibb and Joshua Jackson in 2000. Hide Caption 13 of 15 Photos: Paul Walker: Life in the fast lane Walker and Freddie Prinze Jr. co-starred in the popular 1999 teen film "She's All That." Hide Caption 14 of 15 Photos: Paul Walker: Life in the fast lane Walker's first major role was opposite Reese Witherspoon in the 1998 film "Pleasantville." Hide Caption 15 of 15

JUST WATCHED Touching tribute to Walker's legacy Replay More Videos ... MUST WATCH Touching tribute to Walker's legacy 02:03

JUST WATCHED Paul Walker did 'most generous thing' Replay More Videos ... MUST WATCH Paul Walker did 'most generous thing' 01:44

JUST WATCHED New questions about Paul Walker's death Replay More Videos ... MUST WATCH New questions about Paul Walker's death 01:15

JUST WATCHED Driver: Porsche is like a wild animal Replay More Videos ... MUST WATCH Driver: Porsche is like a wild animal 02:31

Investigators have asked the district attorney to consider charges of felony grand theft and tampering with evidence against both men.

The accident

The crash took place on a wide street in a business park in Santa Clarita, about 30 miles north of Hollywood. Walker was attending a holiday toy donation event for his charity, Reach Out WorldWide, when he hopped into the car, witnesses said.

The Porsche, which was one of only a few hundred made, was on display at the event, which was held at a high-performance car shop owned by Roger Rodas, who was driving the car.

Minutes after the two men drove away, people at the event heard the crash about 500 yards away, witnesses said.

Autopsy results

A one-page preliminary autopsy report released by the Los Angeles County coroner's office Wednesday listed the cause of the actor's death as the "combined effects of traumatic and thermal injuries."

An autopsy concluded that Rodas, who was driving the red Porsche Carrera GT, suffered "multiple traumatic injuries," but it was not clear in the report if he was still alive when the car burst into flames soon after the wreck.