"Will a person who has never heard of Jesus go to hell?" It would hardly seem fair to punish someone for something they never got a chance to do, namely, reject Jesus. But, let's look closer at that question for a moment.
The reason Jesus came was to save us from our sin. What sin?.... the sin of rejecting God. We think more about Jesus saving us from our sins (actions) than him saving us from our sin (heart attitude). Original sin came about when Adam rejected God and God's government. Jesus came to bring the possibility of being forgiven for rejecting God. Faith in Jesus' redemptive work washes away the sin of rejecting God. Rejecting Jesus means we are saying "no thank you" to God's merciful plan of forgiveness for the sin of rejecting God. When we reject God's means of forgiveness (Jesus), then we reject the only way to gain forgiveness for rejecting God in the first place!
I know that's a little confusing, but read that last paragraph again if you need to. Rejecting Jesus is actually rejecting God's plan of forgiveness for rejecting God. The book of Romans says that God has made his existence perfectly clear to everyone in the things he has made. No one has an excuse for not believing in God. Just look around you..... it's so obvious! But there are those who don't want there to be a God, because if there is a God they would owe him their praise and obedience. They would rather have autonomy instead, so they make an argument against his existence. They reject God. And they reject Jesus who is the forgiveness for that rejection!
A person who has never heard of Jesus still has all the obvious proof throughout creation that God exists. If they reject that proof and don't seek after God, they wouldn't have believed in Jesus either. How could Jesus be the son of God if there is no God? God is just and righteous and everyone will get a fair shake. Actually, those who accept God through Jesus Christ will get a merciful shake and those who reject God (whether they also reject Jesus or not) will get a fair shake.... because Heaven is mercy, Hell is justice.