Auburn University student Lauren Burk was not sexually assaulted before she was killed, the Alabama Department of Forensic Sciences confirmed Friday.

Police also said a gas can found in the city's downtown area is being tested for possible DNA evidence or fingerprints. They are not sure whether the gas can is related to the case.

Burk's 2001 Honda Civic was discovered engulfed in flames on campus Tuesday night.

The Auburn freshman was found shot a few miles away about 20 minutes earlier. She was taken to a hospital where she later died.

Police distributed two photos of a 2001 Honda Civic similar to Burk's car. They ask anyone who saw a vehicle matching that description Tuesday to contact the 30-member task force at (334) 501-3140 or the tip line at (334) 501-7337.

Auburn Assistant Police Chief Thomas Dawson said Friday that authorities have "strong leads" in Burk's murder investigation.

At a press conference in Marietta, Burk's family established a public reward fund to help catch her killer in addition to the $10,000 offered by Alabama's governor.

Family friend and spokeswoman Kathy Singleton said that contributions to the Lauren Burk Memorial Fund may be made at any Wachovia bank. If the money does not go to a tipster, she said, it will be donated to charity.

Singleton said Burk's family was grateful for the kindness and prayers expressed during this tragedy and asked for privacy.

"They're in a great deal of pain," she said. "It's a difficult time."

In a statement on behalf of the family, she said that the Auburn Police Department is doing everything possible to find the person responsible for Burk's death.

"The family acknowledges the public's desire for information regarding this crime," she said. "However they respectfully ask for your understanding of their need for privacy at this time."

Singleton spoke to media at Johnson Ferry Baptist Church, where a public memorial service will be held Saturday at 5 p.m. Burk's funeral service will be at 5:30 p.m. Sunday at Temple Kol Emeth.

Singleton said many requests have been made about ways to honor Burk.

She said her favorite charitable cause was the Invisible Children's Fund, which supports starving children in Africa.

Donations may also be made to the American Kidney Fund and the Lauren A. Burk Memorial Scholarship Fund at Oglethorpe University.

Burk's alma mater, Walton High School, held a moment of silence in her memory before Thursday night's girls junior varsity lacrosse game. Burk had played for the JV team, but did not compete her senior year.

In her Marietta neighborhood late Thursday afternoon, friends were devastated by her death.

"It's unbelievable how close it hits," said Matt St. Germain, 24. "Everybody lost something that day, not just her friends."

He met Burk when she was in elementary school and he was friends with her older sister.

"She was an amazing person," St. Germain said. "She was nice to every single person she ever met. Anything you could think of that was good, you could write down about her."