The family of an 18-year-old Texas student who was found dead in a lake is calling for murder charges against two teenagers who police say failed to report his drowning and allegedly tried to dispose of his belongings.

Dallas police told USA TODAY that the teens are facing charges of evidence tampering in the death of Daniel Erving, a student at Sachse High School. Erving's body was recovered from Lake Ray Hubbard on April 17, days after he was reported missing by his family, according to court documents. The Dallas County Medical Examiner's Office found that Erving died of drowning and that the manner was determined to be accidental, police said.

During the investigation, detectives quickly learned that two other young people were at the lake with Erving, according to an arrest affidavit obtained by USA TODAY. The three teens jumped from a railroad bridge into the lake, and after Erving drowned, the others fled the scene, the affidavit said.

Days after Erving's body was found, a 16-year-old told police he had thrown Erving's cell phone out of the window as they drove away at the direction of Lucas Roper, 19, according to an affidavit for Roper's arrest. The teen, who said Roper tossed Erving's clothing, directed police to where the items were discarded, according to the affidavit dated July 8.

Roper told police he "panicked" after Erving drowned and deleted all communications with him from his own phone, the affidavit said. Roper "confirmed he was aware there would be an investigation into Daniel Erving's death and he did not want to get into trouble," according to the affidavit.

Roper and a "juvenile suspect" were arrested and charged with tampering with physical evidence, a third-degree felony, Dallas police said in a statement. Police in Dallas and Rowlett declined to comment further, citing the ongoing investigation.

Erving's mother, Tameca Erving, said the family is not satisfied with the tampering charges at a news conference July 14.

"I feel like my son only received partial justice but we're here to have murder charges brought against those two," she said.

Family attorney Sean Daredia said also called on law enforcement to "bring the appropriate charges, including but not limited to murder."

"Daniel Erving was an honor roll student. He was a member of his swim team. He was a strong, healthy young athlete. For these two suspects to say he drowned and they left, it doesn't add up. It doesn't add up. Something smells off to us," Daredia said at a news conference July 13.

The family is also being represented by attorney Ben Crump, who compared the case on July 14 to another he is involved in: the death of 18-year-old Nolan Wells. Wells, a football player at Southwest Mississippi Community College, was found dead days after a Fourth of July boat trip to Mississippi's Horn Island. No charges have been brought in connection to Wells' death, and Jackson County Sheriff John Ledbetter has said previously that his office has not found signs of foul play.

Crump, appearing alongside Erving's family, said both men died under "highly questionable circumstances" that were equally "unnerving."

"We're going to fight to get to the truth of what happened to Daniel Erving, what happened to Nolan Wells and all of our other young Black boys who mysteriously ended up dead where there might be young white men that have culpability," Crump said.

This story has been updated to add new information.

This article originally appeared on USA TODAY: 2 arrested after Texas teen drowns in lake. Family seeks murder charges