Drafted 2010, 1 #10 overall by Rimouski Océanic in the QMJHL Entry Draft
Drafted 2010, 20 #296 overall by Sioux Falls Stampede in the USHL Entry Draft
Drafted 2011, 9 #91 overall by Amherst Ramblers in the MJAHL Draft
| Season | Team | League | # | GP | G | A | P | PIM | +/- |
|---|---|---|---|---|---|---|---|---|---|
| 2010-11 | Canada | U17 National team games (U17) | 5 | 1 | 1 | 2 | 8 |
| Season | Team | League | # | GP | G | A | P | PIM | +/- |
|---|---|---|---|---|---|---|---|---|---|
| 2024-25 |  Utah Hockey Club | NHL | 38 | ||||||
| 2023-24 | Arizona Coyotes | NHL | 38 | 75 | 5 | 9 | 14 | 153 | 0 |
| 2022-23 | Arizona Coyotes | NHL | 38 | 56 | 3 | 8 | 11 | 114 | -5 |
| 2021-22 | Arizona Coyotes | NHL | 38 | 39 | 2 | 1 | 3 | 106 | 1 |
| 2020-21 | Colorado Avalanche | NHL | 38 | 12 | 0 | 3 | 3 | 40 | 1 |
| 2020-21 | Colorado Eagles | AHL | 38 | 12 | 4 | 4 | 8 | 15 | -1 |
| 2019-20 | Hershey Bears | AHL | 59 | 10 | 19 | 29 | 83 | 14 | |
| 2018-19 | Hershey Bears | AHL (Play-off) | 8 | 1 | 0 | 1 | 21 | 0 | |
| 2018-19 | Hershey Bears | AHL | 74 | 15 | 13 | 28 | 118 | -12 | |
| 2017-18 | Hershey Bears | AHL | 69 | 17 | 9 | 26 | 79 | -8 | |
| 2017-18 | Washington Capitals | NHL | 3 | 0 | 0 | 0 | 5 | 0 | |
| 2016-17 | Hershey Bears | AHL (Play-off) | 6 | 0 | 0 | 0 | 13 | 2 | |
| 2016-17 | Washington Capitals | NHL | 1 | 0 | 0 | 0 | 0 | 0 | |
| 2016-17 | Hershey Bears | AHL | 64 | 10 | 20 | 30 | 117 | 5 | |
| 2015-16 | Hershey Bears | AHL (Play-off) | 20 | 4 | 2 | 6 | 65 | -5 | |
| 2015-16 | Hershey Bears | AHL | 59 | 7 | 9 | 16 | 120 | 2 | |
| 2014-15 | Hershey Bears | AHL (Play-off) | 10 | 3 | 3 | 6 | 14 | 1 | |
| 2014-15 | Washington Capitals | NHL | 13 | 1 | 1 | 2 | 23 | 4 | |
| 2014-15 | Hershey Bears | AHL | 45 | 4 | 4 | 8 | 121 | -5 | |
| 2013-14 | Rouyn-Noranda Huskies | QMJHL (U20, Play-off) | 9 | 1 | 3 | 4 | 12 | -2 | |
| 2013-14 | Rouyn-Noranda Huskies | QMJHL (U20) | (C) | 68 | 20 | 15 | 35 | 148 | -11 |
| 2012-13 | Rouyn-Noranda Huskies | QMJHL (U20, Play-off) | 12 | 2 | 1 | 3 | 17 | 2 | |
| 2012-13 | Rouyn-Noranda Huskies | QMJHL (U20) | 65 | 10 | 14 | 24 | 164 | -12 | |
| 2011-12 | Rouyn-Noranda Huskies | QMJHL (U20, Play-off) | 4 | 1 | 0 | 1 | 2 | -11 | |
| 2011-12 | Rouyn-Noranda Huskies | QMJHL (U20) | 27 | 3 | 7 | 10 | 69 | -17 | |
| 2011-12 | Rimouski Oceanic | QMJHL (U20) | 40 | 7 | 9 | 16 | 67 | 4 | |
| 2010-11 | Rimouski Oceanic | QMJHL (U20, Play-off) | 5 | 0 | 0 | 0 | 6 | ||
| 2010-11 | Rimouski Oceanic | QMJHL (U20) | 61 | 2 | 8 | 10 | 45 | -8 | |
| 2009-10 | Notre Dame Hounds | SMHL (U18, Play-off) | 13 | 4 | 3 | 7 | 30 | ||
| 2009-10 | Notre Dame Hounds | SMHL (U18) | 41 | 13 | 25 | 38 | 98 |
No games found player Liam O’Brien.
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Czech Rep.:
Tipsport extraliga |
1.liga |
2.liga
Slovakia:
Tipsport Extraliga |
1.liga
Sweden:
SHL |
HockeyAllsvenskan
Other: EBEL | Belarus | Croatia | Denmark | Estonia | France | Great Britain | Iceland | Italy | Latvia | Lithuania | MOL-liga | Norway | Poland | Romania | Serbia | Slovenia | Spain | NHL | AHL |
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Finland:
Germany:
Russia:
Switzerland: