It's been quite a while since this case was active, but there is a TON of evidence. IIRC...
1 She said she was the only one in the house with him that night.
2 He was fentanyled, and it was found to have been done by liquid ingestion.
3 She says she mixed the drinks, drank with him, gave him his drink and says she went to bed.
4 She says she went to check on him and found him dead ... and the quantity of fentanyl would have killed him quickly ... but while she claims she called 911 and was trying to resuscitate him with no idea what was wrong, when others arrived there was no drinking glass in sight ...
5 There was an earlier attempt on his life that he survived, using a sandwich
6 He believed she was trying to kill him, telling family that if he was found dead, she would have done it
7 She bought fentanyl twice, and the dealer and the go-between are both testifying about her actions and words (she specifically said she wanted the stuff "that killed Michael Jackson"), and the timing aligns with the two tries to kill him (with the 2nd being successful) -- as well as testimony that she wanted to make sure she had enough the 2nd time to be sure to kill him
8 She was in dire financial straits, only kept afloat by siphoning money from his assets without his knowledge (fraudulently)
9 The marriage was in trouble, and she was going to be cut off financially if/when it ended, and she told others she would be better off if he was dead
10 She was having an affair and making plans with a future with that guy (which apparently he is testifying to) and the only way she could have money come with her would be via a dead ex,
11 She was UNAWARE how he had set up barriers to keep her from his money, assets, company until she tried to grab them after his death
12 She tried to take out LARGE life policies on his death, without him knowing she had done so
13 Her actions after his death were very sus, where her concern was getting at
his money immediately with him gone and unable to stand in the way (but she was found out and stopped)
14 Google searches by her before and after his death on how to kill using fentanyl, how long it stays in the system, on if life insurance pays if death is found to be by poison, on luxury prisons if you are rich and convicted, and so on
15 Evidence in her own writing of trying to alter evidence and tamper with witnesses (in which she concocted a fictitious set of family history "facts" for her family to testify to, to make her look innocent and blame Eric for his death)
That's my list as I best remember it. If you want a longer, more detailed, more reliable set of facts, the state filed in court a 42-page explanation of why she's guilty, and it is outlined precisely with a point-by-point cover list of the particulars.
https://s3.documentcloud.org/documents/24661968/kouri-richins-brief.pdf