I should verify some details: When was he expelled? February 2016. He was first elected on October 19, 2015. The resolution to expel was passed on January 26, 2016, and the actual expulsion occurred in February. After that, the Conservatives had to find a new candidate for the riding. The 2019 election was in October 2019, where Peter Kelly lost to Julie Dabrusin.

Given the ambiguity, I'll structure the post to cover his background, the controversy leading to expulsion, the impact on his riding, the 2019 election results, and perhaps his current status. Maybe also mention the reactions from various parties and the public, as well as the significance of his case in Canadian political history.

I need to ensure accuracy in dates and events. Also, maybe mention any legal aspects or debates about the expulsion process, as it was a significant moment in Canadian politics regarding the treatment of MPs accused of misconduct.

In the 2019 election, the Conservatives tried to retake Sackville–Eastern Shore, but ended up with Peter Kelly against the Liberal candidate Julie Dabrusin, who won. So the post could discuss the aftermath of Schellenberg's expulsion and the Conservative effort in the 2019 election. Alternatively, if there's a recent development where he's making a comeback, but I don't know of any.

Following his expulsion, Schellenberg stepped down as a candidate in the 2019 election. The Conservative Party chose Peter Kelly to represent the riding, but Kelly lost to Liberal candidate Julie Dabrusin. Schellenberg himself did not run in 2019, effectively closing his door to a return to federal politics through the electoral process.

Wait, perhaps there's confusion with another candidate. Maybe the user is mixing up Dr. Schellenberg with someone else. Alternatively, maybe there was a by-election or another way he returned. But I don't recall any such events. Maybe the user is referring to the fact that after his expulsion in 2016, the Conservative party had to find another candidate for the riding, and perhaps he was "patched back in" in some way, but that's not accurate. The Conservatives actually selected a new candidate, Peter Kelly, who ran in 2019 but lost to the Liberal candidate, Julie Dabrusin.