Rather than keep it and be reminded of the suicide, if that is where your mind travels, I'd donate it in the person's name. The gun was bought, used and hopefully enjoyed. If your mind travels in the fond memories of the hunting, range use, etc, then keep it. If you are waffling, before I made the decision, I'd stick it in the garage an forget about it for awhile until the decision could be made. If it's always emotional or uncomfortable to be around, then you have your decision. Either way, don't let the person's life be defined by one single act of desperation.