During the fight, court documents say Walker stabbed the teen in the back.
SIOUX CITY, Iowa -
23-year-old Anthony Walker of Sioux City is changed with willful injury and assault while participating in a felony.
23-year-old Efrain Valencia-Aguilera of South Sioux City, Nebraska is charged with theft.
Police say around six Thanksgiving morning, Valencia-Aguilera and Walker were watching a fight outside 1622 Ingleside Avenue.
During the fight, court documents say Walker stabbed the teen in the back.
Valencia-Aguilera allegedly picked up the teen's hat and "wore it as his own" to hide from police.
The teen's name has not been released.