He'd finish his slow evolution into Jennifer Diane Reitz.
They're like sisters...
Chris would probably start by expressing some obviously false sympathy which would at some point devolve into him going "she's going to have to explain herself to St. Peter for her trolling empire days" or some other version of him trying to say that she's going to burn in hell for trolling him. Knowing Chris, he'll try to say it in a way that he thinks will come across as sly and not immediately identifiable as him saying incredibly negative things about a dead woman, which of course will mean that he's going to be incredibly offensive to just about everyone.
Depending on where the funeral is, he
might try to attend, but it's unlikely he'd go unless it was local. Even then he'd probably sit at home and whine about on both ends of the spectrum about how bad she was to him and how he wanted her to be his heartsweet. Odds are he wouldn't go because he'd expect it to be full of trolls. At the very least he'd assume that Snyder would be there and this would probably keep him from going, since Snyder probably has a restraining order against Chris still.
But of course what all of us would want to happen is that Chris goes into the morgue overnight and violates her cooling corpse, making his infamous SheCameForCWC picture a reality. He'd then immediately upload the images to somewhere to prove that he's not gay and maybe try to pass this off as Megan being alive. Chris would attend the funeral dressed in his TomGirl finest, complete with makeup. He'd walk up to the front of the church, solemnly stand at the podium, and then rant about how Megan led him on and was responsible for his current life, how she was a trolling mastermind and trolled him up to her dying day, and how he knows that she'll have to roast in Hell since GodJesus won't allow her. He'd probably try to add in some things about how Sonichu and his other imaginary friends all think she's awful but that they hope she'll learn the mercy of GodJesus while Satan is shoving pineapples up her butt. By this point he'd be in the process of getting forcibly removed. Chris would kick and scream all the way, riding up his skirt and flashing everyone his panties. He'd tip over the coffin, Megan's corpse spilling all over the ground. All of this would be on YouTube, naturally.
But it's most likely that he'd just make a small rant on facebook and then shrug it off. Somewhere down the line her depiction in his eyes will either get worse or it'd revert back to him thinking that she was just too shy and he could've hit that if she'd been as mature as he was.
He'd wither away under the lack of attention. Part of him will always need to feel like people are after him. It makes him feel important.