The US government is "deeply saddened" by the drive-by shooting murder of Australian baseball player Chris Lane in Duncan, Oklahoma.

During a press briefing in Washington DC on Tuesday that covered the unrest in Egypt, Middle East peace talks and the Bangladesh elections, a spokesperson for US Secretary of State John Kerry, Marie Harf, was asked about Mr Lane's death.

"The United States is deeply saddened to hear the tragic news of the death of an Australian citizen in Oklahoma," Ms Harf said.

"This is clearly a tragic death, and we extend our condolences to the family and the loved ones. We understand that local authorities are focused on bringing those responsible to justice. Clearly, we would support that."

The State Department's comments came after former deputy prime minister Tim Fischer urged Australian tourists to stay away from America to protest the need for stricter gun controls in the US.

Duncan schoolboys James Edwards, 15, and Chancey Luna, 16, have been charged with first-degree murder and face life in prison without the possibility of parole if convicted.

Michael Jones, 17, was charged with using a vehicle to facilitate the discharge of a weapon and accessory after the fact of murder in the first degree.

Jones faces up to 45 years in jail if convicted.

Prosecutors allege the boys randomly selected Mr Lane on Friday while he jogged down a Duncan street.

Mr Lane was shot with a .22 revolver "for the fun of it" because the boys were bored, authorities allege.

Mr Lane, 22, from Melbourne, had a scholarship to study and play baseball at Oklahoma's East Central University.