Watch: Video shows the moment Alex Pretti is shot and killed in Minneapolis by federal agents

WARNING: GRAPHIC CONTENT: A US citizen shot dead by federal agents in Minneapolis was an ICU nurse who "wanted to make a difference in this world," family members said.

Alex Pretti, 37, was shot and killed during a scuffle with immigration officials less than three weeks after an Immigration and Customs Enforcement (ICE) officer shot and killed Renée Good in her car.