Three teenagers who, on Friday, killed an Australian citizen attending an Oklahoma college on a baseball scholarship, committed the random act of violence because they were bored and wanted to have some fun, police officials told the media on Monday.

Associated Press reported that Christopher Lane, 22, a native of Melbourne, Australia, was found dead on Friday while visiting Duncan, Okla., where his girlfriend lives. Three teenagers between the ages of 15 and 17 are in police custody for their role in the murder, and they are scheduled to be presented in court on Tuesday afternoon.

According AP, first degree murder charges are expected to be filed against them, but it is not known if they will be charged as adults or juveniles.

Danny Ford, Duncan's police chief, told AP that the shooting was a random incident, and one of the suspects, a 17-year-old gave a detailed confession to the police about the incident.

“They saw Christopher go by, and one of them said: ‘There’s our target,’” Ford told AP. “The boy who has talked to us said: ‘We were bored and didn’t have anything to do, so we decided to kill somebody.’ They followed him in the car to that area, shot him in the back and drove off.”

ABC News reported that there were no witnesses to the shooting, but people heard a gunshot and saw a black car pulling away from the scene of the shooting. The same car with three teenagers was later found parked near a church.  

“They were pretty uncooperative," Ford said about the teenagers. "[But] after questioning them and getting consent to search the car, we found evidence that made us believe they were involved."

He, however, refused to divulge the nature of the evidence found. 

According to the ABC News report, autopsy results are pending and the murder weapon has not been found yet.

Lane attended East Central University in Ada, about 85 miles west of Duncan, and he and his girlfriend, Sarah Harper, had only returned to the U.S. from Australia last week. “He didn't deserve any of this," Harper told ABC News. "It's heartbreaking that it was such a random choice those guys made that drastically altered so many lives in the process."