A federal grand jury previously indicted Kevin Thissel and Christopher Johnson in connection with the death of Irah Sok.
The man, who faces a charge under the state’s controlled substance homicide law, remains in Snohomish County Jail on more than $1M bond.
The 11-year-old is in critical condition, the sheriff’s office said. Investigators believe the shooting was gang related.
Prosecutors alleged the two men stored fentanyl and other drugs while staying in a south Everett apartment.