Alex Pretti, a 37-year-old ICU nurse, was fatally shot by federal officers during an anti-immigration rally in Minneapolis. Here's what we know so far.

The killing of the 37-year old man sparked a surge of protests in a city already furious about the ICE killing of Renee Good.

Alex Pretti, 37, worked in the ICU at the Minneapolis VA Health Care System and had assisted on scientific research