[11][12] On November 7, in his fourth game, Wideman scored his first NHL goal against goaltender Cam Ward in a 3–2 overtime loss to the Carolina Hurricanes.

[16] During the 2018–19 season on October 14, Wideman ended a year-long goal-scoring drought when he scored two goals against the Los Angeles Kings.

[17] On November 4, a video was released showing Wideman and six of his teammates criticizing the Ottawa Senators and mocking assistant coach Marty Raymond while riding in the back of an Uber vehicle in Phoenix, Arizona.

[23] Wideman made his Panthers debut in a 4–3 overtime defeat to the Columbus Blue Jackets on January 5, 2019, before he was placed on waivers the following day.

[24] He cleared waivers and was assigned to the Panthers' AHL affiliate, the Springfield Thunderbirds, where he collected 3 goals and 13 points through 16 games from the blueline.

[25] As a free agent from the Penguins, Wideman was signed to a one-year, two-way contract with the Anaheim Ducks on July 16, 2019.

[27] As an impending free agent from the Ducks, Wideman opted to pursue a career in Russia, agreeing to a one-year contract with Torpedo Nizhny Novgorod of the Kontinental Hockey League (KHL), on June 1, 2020.

[19][29] Following his success in the KHL, Wideman returned to the NHL for the 2021–22 season after signing a one-year, $750,000 contract with the Montreal Canadiens.

[33] On April 16, 2024, after missing the entirety of the 2023–24 season due to a serious back injury, Wideman announced that he would likely never play professional hockey again.

[38] He was named to Team USA for the 2021 IIHF World Championship[39] and won a bronze medal as they beat Germany 6–1, coming third in the tournament.