Right. That's not going to be hard. He's being charged with cyberstalking, but just for factual reference, this is from the DOJ:
"Evidence received pursuant to a search warrant showed Rivello’s Twitter account contained direct messages from Rivello’s account to other Twitter users concerning the victim. Among those direct messages included statements by Rivello, including “I hope this sends him into a seizure,” “Spammed this at [victim] let’s see if he dies,” and “I know he has epilepsy.” Additional evidence received pursuant to a search warrant showed Rivello’s iCloud account contained a screenshot of a Wikipedia page for the victim, which had been altered to show a fake obituary with the date of death listed as Dec. 16, 2016. Rivello’s iCloud account also contained screen shots from epilepsy.com with a list of commonly reported epilepsy seizure triggers and from dallasobserver.com discussing the victim’s report to the Dallas Police Department and his attempt to identify the Twitter user."
So yeah. When you've got someone stating "I hope this gives him a seizure," "Let's see if he dies," altering his Wikipedia page to show a death date and obit, and looking up information on the kinds of seizures that cause death, you haven't exactly established a strong defense for how this should be treated anything less than extremely seriously. This isn't a prank. It was a deliberate attempt to injure or kill someone.
Do you know how many epileptics die as a result of seizures every year in the US alone? Roughly 50,000. Provoking a seizure in an epileptic is not a fucking joke.