Whodunnit? Whodunnit?

On last week's Whodunnit?, Ulysses was killed after he was thrown off a spooked horse. Or was he?

Whodunnit?: The Killer answers our burning questions

In the exclusive sneak peek of Sunday's episode below, Kam and Geno investigate the crime scene and try to piece together how Ulysses' horse got startled by a flock of pigeons in the first place. Plus: They find a very

interesting (and slithery) clue hidden in a knapsack.Check out the clip below. How do you think the Killer pulled this one off — and who do you think the Killer is?
Whodunnit? airs Sundays at 9/8c on ABC.