Interesting. "Conspiracy to commit murder." Conspiracies involve two or more people. It seems obvious to me that Alex would be a coconspirator since he's the one who killed Charles, but it just struck me that Chad could be implicated as a coconspirator as well for a number of reasons:
1) There is evidence that Chad and Lori were having a relationship prior to Charles being killed. The dancing video Lori sent to Chad, witness testimony of them being together frequently and going to the temple, hidden communications between them (burner phones, emails disguised as coming from Charles), etc.
2) Lori claiming Charles was possessed by an evil spirit named Nick (or Ned) Schneider, something she picked up from Chad per witness testimony. Other teachings and beliefs originating from Chad painting Charles as an evil person, dark spirit, and/or zombie. Direct or indirect threats from Lori that Charles needed to or would die.
3) Evidence that Chad and Lori were planning on being together (their "mission" statement and goals) at some point.
4) Chad would benefit from the death of Charles, either directly or indirectly (he could then marry Lori and presumably have access to his life insurance or other death benefits through said marriage).
So even though Chad wasn't there that day I believe there may be enough evidence to bring charges against him as a coconspirator in the murder of Charles. MOO and IANAL.