Leslie Alfred Camilleri was born on May 31, 1969, in Liverpool, New South Wales. He was the fourth child in a family of six children. Camilleri did not meet his biological father until he was 13 years old. His early life was marked by difficulties and challenges. A psychiatric report from 1993 described his childhood as deprived, mentioning his behavior patterns, which included theft and vandalism. These actions were linked to social isolation and frustration. Due to his poor impulse control, his frustrations sometimes led to explosive outbursts.

As a child, Camilleri was considered "uncontrollable." He spent a significant part of his youth in juvenile detention. Between the ages of 10 and 12, he escaped from the institution and lived on the streets in King's Cross, Sydney. His life became increasingly unstable, and he was eventually brought back to the children's court by the police. The court ordered him to return to the juvenile detention center, where he stayed until he turned 15.

On October 5, 1997, Lauren Barry and Nichole Collins were camping near Bega. They left their campsite to walk to a nearby party. Nearby, Leslie Camilleri and Lindsay Beckett were drinking and using drugs when they drove past the girls. They stopped and offered the girls a ride, which they accepted.

After picking up the girls, Camilleri and Beckett drove them around, making stops at various locations. At some point, they became aggressive and threatened the girls with knives. Camilleri and Beckett drove them to secluded areas, where they assaulted them.

The situation escalated, and the next morning, they arrived at Fiddler's Green Creek near the Victoria/New South Wales border. The girls were tied up and forced to walk in the bush for some time. Camilleri instructed Beckett to drown the girls to eliminate any evidence of their previous actions. Beckett was initially hesitant but eventually complied after threats from Camilleri.

Beckett first attacked Lauren Barry, attempting to drown her, but after a struggle, he stabbed her. He then went to Nichole Collins, who had heard what happened to Lauren and realized her fate. Beckett attacked her as well, stabbing her multiple times.

After the murders, Camilleri and Beckett attempted to cover their tracks. They drove back towards Canberra, stopping to dispose of evidence, including clothes and weapons. They were careful to clean their vehicle and destroy anything that could link them to the crime.

Later, police began investigating the disappearance of the girls. They arrested Beckett after finding a stolen car connected to him. He eventually confessed to the murders and guided police to the crime scene. Camilleri was also arrested, and both men faced serious charges, including abduction, rape, and murder.

During the trials that followed, evidence was presented against both men. Camilleri tried to minimize his involvement, claiming he was mostly unconscious during the events. In the end, both were convicted and given life sentences, never to be released.