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.