I highly doubt dr Singh is white. Did they mean “white Indian”? As he didn’t defend himself with a firearm, probably not. So I suspect the correct description is brown, not white......
http://omidsafi.religionnews.com/2013/09/23/singh/
This Sikh dude is so white he looks as white as the average German, not the average Italian
If by “white” you mean European or American Caucasians dressed in EuroAmerican clothing styles, then Sikhs are not “white.” Otherwise, if Italians, northern and southern, are white then so are Sikhs. They are just as Caucasian as you or me- well I am sure about me, you I haven’t met.
Officially, Indian subcontinent natives are Caucasian, just like the rest of the "white" race. They just happen to have lived in a high-insolation environment long enough for their bodies to regain some of the ability to make melanin that their ancestors lost before their subset of Caucasian moved away from their homeland...a low insolation environment.
Well go to the site and look at his white face.