Robert Cox is at the center of the prosecution’s case because this murder appears to require more than general anger. It requires private knowledge. A delayed poisoning hidden in a trusted bottle suggests someone who understood Patsy’s habits well enough to rely on them.
The prosecution argues that an ex-husband is not suspicious simply because he once had a close relationship. He is suspicious here because the method seems built for someone who knew how Patsy lived when no one else was watching. In this theory, the killer did not need to force entry, stage a confrontation, or remain near the victim. The killer only needed to know Patsy would eventually do what she always did.
He was Patsy’s ex-husband and may have known her private routines, vulnerabilities, and trusted habits.
The prosecution says Patsy’s continued life and voice may still have posed a threat to him.
Familiarity is not proof. Other people in Patsy’s world also knew her habits and had reasons to resent or fear her.
This is why Robert Cox matters so much in the trial game. He is the suspect the prosecution says best aligns with the bottle, the method, and the silence the killer needed. The defense says that is still only a strong theory, not a singular answer.
The jury’s job is not to decide whether Robert Cox is suspicious. The jury’s job is to decide whether he stands far enough above the other possibilities to carry the weight of conviction.