Earlier quoted context omitted.
Your only data point is the ethnicity of the victim, and that's all it takes for you to suggest it was a hate crime?
Another data point is that Jews are getting killed and assaulted around the world. With that said, I agree that for now there's no actual evidence supporting this allegation. But I wouldn't be totally shocked to learn that his ethnicity or zionist beliefs had something to do with this, if indeed he was Jewish (which hasn't been confirmed).
This is problematic because most of the sources saying he was Jewish and pro-Israel seem to be quoting each other. The Wikipedia reference was added yesterday and removed today because the linked sources didn’t say anything about his religion, and I haven’t seen any sources about pro-Israel stances which I’d think would be easier to find if he was outspoken enough to be targeted. It’s still quite possible that he was the unfortunate victim of a stalker-most of the professors I know have had to work with security to keep someone off campus because colleges attract a certain brand of mentally ill people–but it seems odd that these sources are so confident about this assertion without citing sources.
Based on e.g. https://news.mit.edu/2018/nuno-loureiro-faculty-physics-1016 it really seems like his passion was physics and I think we should commemorate someone who tried to improve humanity’s understanding of the universe. If new details emerge, I’m sure they’ll be posted here.