Kessel's time with the Maple Leafs was marked by many highs and lows, but it was certainly never boring.
As Leafs fans say goodbye to the polarizing sniper, here are five memorable moments from his time in Toronto:
5. 'Battle of Ontario' hat trick
Kessel reached the 30-goal plateau for the fifth time in his career in style with a hat trick against Ontario-rival Ottawa on February 1, 2014 in a 6-3 Toronto victory.
This was Kessel's fourth (and most recent) three-goal game, and third with the Maple Leafs.
4. Off-season fishing tweet
Kessel took some heat during Toronto's 2014 off-season for this seemingly innocent tweet, which he later deleted:
Toronto fans made sure to point out to Phil that participating in the Stanley Cup playoffs would certainly trump fishing, at night or otherwise.
3. All-Star draft
Who can forget Alex Ovechkin's wry smile as he snapped photos of an embarrassed Kessel, who got selected last in the 2011 All-Star draft?
At least Kessel got a car for his troubles.
2. Playoffs against Boston
Even when Kessel was at his best for Toronto during the 2013 playoffs against Boston (four goals, two assists in seven games), things still didn't work out favourably for the Leafs.
Although he had a strong series against his former club, it was not enough, as Toronto collapsed in epic fashion in Game 7 and was eliminated from the playoffs.
That was Kessel's first (and only) playoff appearance in a Maple Leafs jersey.
1. Media blowups
The most infamous Kessel moment has to be his tirade on reporter Dave Feschuk last season.
But Kessel's run-in with Feschuk was hardly the winger's first with the Toronto media.
Kessel's time in Toronto may have come and gone, but it surely won't be forgotten any time soon.