Seamus Casey (born January 8, 2004) is an American professional ice hockey defenseman for the New Jersey Devils of the National Hockey League (NHL). He was drafted in the second round, 46th overall, by the Devils in the 2022 NHL Entry Draft.^[1]

Casey was born in Miami on January 8, 2004, to Steve and Karen Casey. When he was around the age of five the family moved to Fort Myers, Florida, where he met now-Columbus Blue Jackets prospect Gavin Brindley, who became a close friend and with whom he would play youth, junior, and collegiate ice hockey.^[2]

At twelve, Casey moved to Detroit to play for the Compuware Youth Hockey AAA program.^[2]

Casey was scouted by the University of Michigan while playing for Compuware, at a game in which he was moved to forward due to injuries.^[2] He committed to Michigan in October 2018.^[3]

Casey was drafted by the Sarnia Sting of the Ontario Hockey League (OHL), but elected instead to play for the USA Hockey National Team Development Program (NTDP).^[2] Had he chose to enter the OHL, he would have voided his NCAA eligibility.^[4]

In the 2020–21 season with the NTDP, Casey's 36 points and 28 assists in 48 games ranked first among U17 team defensemen.^[5]

Returning to the NTDP for the 2021–22 season, he scored 33 points in 48 games, second among defensemen on the U18 team behind Lane Hutson.^[6] He was chosen as one of the top draft-eligible junior players in the United States to attend the 2023 USA Hockey All-American Game.^[7] After the season, he was selected in the second round of the 2022 NHL Entry Draft, 46th overall by the New Jersey Devils, the team he supported as a child.^[1]

Making good on his commitment to Michigan, Casey joined fellow Devils draftees Luke Hughes and Ethan Edwards on the Wolverines for the 2022–23 season.^[8] He scored a respectable 29 points in 37 games, second to Hughes among Michigan defensemen, and played one game at center, an exhibition match against the NTDP in which he had two goals and an assist.^[1] Michigan won the Big Ten Conference, but lost in the semifinals of the 2023 Frozen Four to the eventual champions, Quinnipiac University.^[9]

In his sophomore season, the 2023–24 season, Casey recorded seven goals and 45 points in 39 games, earning All-Big Ten First Team and First Team All-American honors. For the second straight year, Michigan won the Big Ten only to be eliminated in the Frozen Four semifinals by Boston College.^[7][10]

Casey turned professional on May 6, 2024, after signing a three-year, entry-level contract with the Devils.^[11]

Quick Facts Medal record, Representing United States ...

Medal record
Representing  United States
Men's ice hockey
World Junior Championships
	2024 Sweden
	2023 Canada
World U18 Championships
	2022 Germany

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Casey represented the United States at the 2022 IIHF World U18 Championships, scoring six points in as many games.^[12]

Casey traveled with Team USA to the 2023 IIHF World Junior Championship, but did not dress for any games. Michigan teammate and fellow Devils draftee Luke Hughes also attended the tournament.^[13]

Casey was named to Team USA's roster for the 2024 World Junior Ice Hockey Championships,^[14] where he recorded six assists in six games en route to a gold medal. He missed one game due to illness.^[15]