In my opinion, it is a nice thing to do. A visit is also a kind of reminder for us that death clock is ticking and it helps us realises that we should value every moment of life and live it well. I know people who after seeing sudden death in family or friends, have altered their courses of life for better causes, they thought if we have die then we should live for others.
Plus we should pay respect to any dead person whether we know him or not, and I hope he would not mind that anyway :-)

Regards
ZILCH HOUR