The parents of Alex Pretti, the 37-year-old nurse killed by federal immigration agents in Minneapolis earlier this year, accused federal officials of stonewalling them and shielding their son’s killers.

During a press conference on Tuesday, Michael and Susan Pretti made their first public remarks since their son’s death in January, calling for the Department of Justice to hold those involved in their son’s death accountable. The federal government has not provided them with meaningful information about the case, they said.

“At every turn, they have ignored us, misled us and shielded Alex’s killers,” said Michael Pretti. “We are a family who love this country. We trust in the institutions of this country. We believe in the rule of law – and that people should be held accountable through that law.”

Pretti, who worked at a veterans hospital, died on 24 January after being fatally shot by federal immigration agents.…