Is it true that witnessses that commit suicide cannot have a memorial at the Kingdom Hall??
I don't think there is a definite yes or no answer to that one.
There have been instances where funerals for a suicide victim were not allowed and instances where it was allowed. I think it comes down to the local body of elders and how they feel about it and the circumstances surrounding what happened.
A JW friend of mine committed suicide. The funeral was a private affair, family only, at the graveside, but a memorial service was held at the hall a week later for others to pay their respect. But there will be people on this board who can tell you horror stories at how their family was treated when a family member committed suicide and how they weren't allowed to use the hall for services.