First off-- Nima is a person of interest. It doesn't mean he's guilty of anything. Even if they were in a car together, argued and Bob left the car and walked it doesn't mean Nima killed the man.
I assume (and hope) the police have more solid evidence like a fingerprint on that knife or Nima's own blood/DNA at the scene or on the knife as is common with stabbings.
I assume (and hope) the police have more solid evidence like a fingerprint on that knife or Nima's own blood/DNA at the scene or on the knife as is common with stabbings.