MINNEAPOLIS — The family of Alex Pretti, the Minneapolis nurse fatally shot by immigration agents in January, accused the federal government Tuesday of keeping them in the dark about the investigation into their son’s killing.

Steven Schleicher, a lawyer representing Pretti’s parents, Michael and Susan, said the Justice Department’s refusal to share basic information with the family amounted to a violation of the federal Crime Victims’ Rights Act.

“It is impossible to convey how the government’s refusal to engage in transparent communication with the Pretti family has compounded their heartbreak,” Schleicher wrote in a letter he sent to Attorney General Todd Blanche in July.

Schleicher provided a copy of the letter, which was first reported by CNN, on Tuesday morning before a news conference in Minneapolis during which Pretti’s parents are expected to speak about the case.

Federal officials have yet to disclose information as basic as the identity of the agents who fired at least 10 bullets into Pretti’s…