Possible Clues:

• 'The Devil in the White City' author Larson
• "Red" Viking
• Norse name that means 'eternal ruler'
• Norse name that means "eternal ruler"
• 'Black Panther' villain Killmonger
• "The Devil in the White City" author Larson
• Explorer dubbed "the Red"
• 'Black Panther' supervillain Killmonger
• Karlsson of the NHL
• With 117-Across, co-star of TV's "CHiPs"