Lieutenant Ronickson Pimentel, brother of Eloá Pimentel, remains in serious condition after being shot in São Caetano do Sul.
A suspect linked to the logistical planning of the attack was killed in a confrontation with the Rota police unit.
Two other individuals are currently in custody on suspicion of providing support for the premeditated assault.
Medical staff at the Hospital Estadual Mário Covas report positive clinical developments in the officer's neurological recovery.