The 22-year-old is charged with three counts of aggravated murder, the most serious of charges in Vermont that carries a life sentence without parole.
Brian Crossman Jr., 22, has been charged in the fatal shootings of Brian Crossman Sr., 46, Erica Crossman, 41, and Colin Taft, 13, at their Pawlet, Vermont, home, while he was visiting from Granville, New York, Sep. 13.
Agents arrived at Rosenwasser's home early Tuesday morning to execute an arrest warrant; however, they were met with immediate gunfire.