Even if the police were able to establish that the ruler and calculator belonged to the victim, it is merely circumstantial evidence. It does not prove Williams was the killer.
Here is a quick summary of the main issues: (1) There is no reliable evidence that Williams is guilty of the crime; (2) The DNA evidence from the crime scene does not match Williams; (3) Numerous legal experts, including St. Louis County Prosecuting Attorney Wesley Bell, argued convincingly that Williams' death sentence should have been commuted to life in prison, at a minimum; (4) A Republican governor ignored the facts and legal opinions and simply murdered Williams.
Here is a quick summary of the main issues: (1) There is no reliable evidence that Williams is guilty of the crime; (2) The DNA evidence from the crime scene does not match Williams; (3) Numerous legal experts, including St. Louis County Prosecuting Attorney Wesley Bell, argued convincingly that Williams' death sentence should have been commuted to life in prison, at a minimum; (4) A Republican governor ignored the facts and legal opinions and simply murdered Williams.