Hellberg was placed on waivers Saturday, according to Elliotte Friedman of Sportsnet.
Hellberg will guard the road goal in Monday's preseason matchup against the Avalanche, according to Sam Nestler of DLLS Stars.
Hellberg inked a one-year, two-way contract with Dallas on Tuesday.
Hellberg was traded to the Panthers by the Penguins on Friday in a swap for Ludovic Waeber and a 2025 seventh-round pick.
Hellberg was reassigned to AHL Wilkes-Barre/Scranton on Thursday.
Hellberg was reassigned to AHL Wilkes-Barre/Scranton on Sunday.
Hellberg will defend the visiting crease in LA on Thursday, per Penguins play-by-play announcer Josh Getzoff.
Hellberg was called up from AHL Wilkes-Barre/Scranton on Wednesday.
Hellberg was waived by the Penguins on Sunday, Chris Johnston of TSN reports.
Hellberg signed a one-year contract with Pittsburgh on Sunday.