- Name: 3 William Mrowka
- Nationality: —
- Position: F
- Shot: Left
- DOB: 04/25/2003
- Height: 5-10
- Weight: 165
- Hometown: Duxbury, MA
- 2019-20 Team:
- 2018-19 Team: Duxbury H.S. (MA)
- 2017-18 Team: Boston Jr. Terriers U14
- NHL Draft Eligible: 2021
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