Helewka signed a one-year contract with Barys Nur-Sultan (KHL) on Thursday.
The Devils placed Helewka on unconditional waivers for the purpose of terminating his contract Thursday, Renaud Lavoie of TVA Sports reports.
Helewka signed a one-year, two-way contract with the Predators on Wednesday. The deal will be in effect starting with the 2019-20 season.
Helewka and Laurent Dauphin were sent to Nashville from Arizona in exchange for Emil Pettersson on Friday.
The Sharks traded Helewka to the Coyotes in exchange for Kyle Wood on Thursday.
Helewka was called up from AHL San Jose on Sunday. He skated for 9:22 of ice time and went minus-3 in the evening's 5-3 win over the Golden Knights.