U.S. Marshals have issued a warrant for the arrest of a man involved in a deadly shooting in Portland last June.

The shooting happened in Morrill’s Corner during a confrontation between two biker gangs, leaving 54-year-old Susan McHugh dead.

On Tuesday, the U.S. Marshals Service issued a warrant for the arrest of 46-year-old Kristofer Haken, who faces an elevated aggravated assault charge.

Haken is among seven people charged in connection with the shooting, including 47-year-old Aaron Karp of Naples, who was sentenced to five years behind bars.