The wreckage of the Learjet carrying Travis Barker, Adam Goldstein and four others
A South Carolina coroner investigating the weekend jet crash
that took the lives of four and left Travis Barker and DJ AM in critical condition
cites smoke inhalation and burns as the causes of death for the pilot and co-pilot, and impact-related injuries for the two other passengers.
"All we need now are results of the toxicology reports from the pilots," Lexington County Deputy Coroner Brian Setree, tells PEOPLE. "I don't anticipate anything there, but we will know for sure in about a week."
Killed as the Learjet 60 took off from Columbia, S.C., around midnight Friday were pilot Sarah Lemmon and co-pilot James Bland, along with passengers Chris Baker and Charles Still, who worked for the musicians.
Memorial funds to assist family survivors have been established for Chris Baker and Charles Still. Contributions may be sent to the respective funds at the following address:
1840 S. Milliken
Ontario, CA 91761
– Reporting by JENNIFER GARCIA and LINDA MARX