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N.D. (NewsDakota.com) The mother of a North Dakota State College of Science student killed by a gunshot earlier this year still has questions about her son’s death, and she said Monday she’s not sure that authorities are working to answer them.

Andrew Sadek, 20, was last seen alive May 1 as he left his dormitory in Wahpeton. After an extensive search, his body was found June 27 in the Red River near Breckenridge, Minnesota. An autopsy showed he died from a gunshot to the head, but authorities have not determined whether the wound was self-inflicted or whether someone else shot him.

His mother, Tammy Sadek, believes her son was murdered. He was facing a felony charge accusing him of selling marijuana, and she says a regional drug task force was pressuring him to be an informant.

Tammy Sadek said Monday in a radio interview that she thinks authorities are operating under the theory that Andrew committed suicide.

But she doesn’t believe the facts match the theory. Sadek previously disclosed that when Andrew’s body was found, he was wearing different clothes than those he was last seen wearing. Also, the .22 revolver used in the shooting still hasn’t been found.

Monday, Sadek revealed that when the family brought Andrew’s car home, they made another discovery: “There were several inches of water standing in the spare tire wheel well,” she said in an interview on KFGO.

The car had been left in a school parking lot but, due to a broken security camera, no one knows when it had last been driven, she said.

Sadek believes someone may have dumped her son’s body and then returned the car to campus. “We would like a Luminol test done on Andrew’s car to see if there are any traces of blood in it,” she said.

She also wants to know why larger agencies are not taking over the case from the NDSCS police. “The FBI has to be asked to come in and so does BCI,” said Sadek. “And nobody is asking them.”

NDSCS said in a release Monday afternoon that it remains open to speaking with the Sadek family about the case, which is still an open investigation.

School officials said part of the investigation, a forensic analysis of Andrew Sadek’s cellphone, involves the North Dakota State Crime Lab and the FBI. The search for the .22 revolver used in the shooting is suspended due to weather conditions, they said.

“As in the past, NDSCS has offered the Sadek family an open line to NDSCS Sergeant Steve Helgeson of Campus Police whenever they have questions or concerns regarding the death of their son, Andrew Sadek,” school officials wrote in a release.

Sadek urged parents of NDSCS students to talk to their children about the case when they’re home for Christmas break. “Find out if they know anything about this case,” she said.

Sadek has also launched a Facebook page “Justice for Andrew Sadek.” She’s encouraging people to leave tips on the page or message her with information concerning Andrew’s disappearance or death.” She said she promises anonymity for those who step forward.