1. Thor gets hit by lightning and dies
2. Aquaman is pushed into the sea by Thanos and drowns.
3. Spiderman gets bitten by a venomous spider and dies.
4. Batman gets killed by a swarm of bats
5. Miss Death dies due to age
6. Superman and Thanos have a final fight, while it seems like Superman is winning, Thanos does the default dance and causes the whole universe to colapse.