The Jets waived Castillo on Tuesday, Ethan Greenberg of the team's official site reports.
Castillo missed three of four field-goal attempts in Sunday's 40-3 loss to the Seahawks, predictably leading to his departure from the Jets. Sam Ficken (groin) is expected to be activated from IR and start in this week's game against the Rams, according to Al Iannazzone of Newsday. The Jets also claimed kicker Chase McLaughlin off waivers from the Jaguars in case Ficken suffers a setback.