After the murder, Sigfredo calls Katie to tell her the murder is done. She says, "I know."
How does she know?
CA, DA, HA, KM are in Miami.
SG and LR are in the car on the way back to Miami.
Who among the (alleged) conspirators is in Tallahassee and near enough to the crime scene to hear those two anticipated gunshots? Who is parked nearby within earshot? Who of the alleged conspirators was near enough to recognize a man they likely met with Katie when they partied at CA's home (where CA roomed with Dr. Obed - according to his deposition) in the past? Who of the alleged conspirators knows WHO to look for during the crucial time between when the boys are dropped of at school and Dan's flight out of town? Who of the alleged conspirators is in Tallahassee and knows Dan's schedule? Which one of the alleged conspirators is recognized by one of the killers?
How could Sigfredo know Wendi on sight? Maybe, because, as Dr. Obed testified, they met before?
Is it possible that owing to the first aborted attempt to murder Dan, someone in Tallahassee was given the task of lingering around the crime scene to make sure they heard the gunshots and report mission accomplished to both KM and CA? JMO.