Earlier this week, teams around the National Hockey League had a deadline to sign specific college prospects, with the majority of them becoming unrestricted free agents.
Because the 23-year-old was a first-round pick and didn't sign, the Philadelphia Flyers will receive a compensatory draft pick in the second-round in 2024 from the National Hockey League. The pick is slated to be the 19th selection of the second-round to match what he was taken in the 2018 draft.
O'Brien spent the last three seasons at Boston University in the NCAA. He initially began his collegiate career with Providence College in 2018-19, but decided to play in the BCHL for the 2019-20 season. Before signing in the BCHL, O'Brien entered the NCAA transfer portal and decided to join Boston University.
The Hingham, Massachusetts native appeared in 39 games this past season with BU, putting up 32 points (eight goals, 24 assists), 42 penalty minutes and was a minus-one.