Manta said:
For a 3 way tie, I recommend a d6. Assign 2 numbers to each player and then roll to see who dies. 4 way tie can be solved by a similar method with a d20 or just 2 coins. For a coin flip online here is a link to one, I recommend you choose a random coin to make things a little more random. I am unsure how random they truly are so don't blame me if they turn out to use a seed, thus not truly being random. Random.org
I've actually come up with a highly random method to use:
1. Generate 3 pseudorandom numbers between 1 and 1 million. Call them m,n, and o.
2. Find the m th digit of pi. Call it x. Find the n th digit of pi and call it y.
3. Flip a real coin. If heads, go (x*y) digits forward from the o th digit of pi. If tails, go that many digits backward.
The number you arrive at is your random number.