Kathleens murder premeditated?

Just finished watching the Staircase and I live in Raleigh NC I remember following the case 20 yrs ago I always thought he was guilty especially after Ratliff news came out was a big shocker. Now after watching I still think hes guilty as hell. I dont see a huge motive for killing Ratliff sure 125k trust for the daughters was a decent chunk of money in the 1980s but no fortune and comes with 2 kids. He probably was having an affair with her and she wanted to break it off and he wouldnt let her or she refused his sexual advances that night he got angry lost his temper and hit her or tried strangle she wasnt dead but he knew he had to finish her off or he be in big trouble so he beat her then staged the scene. He knew the military police would probably take the scene for granted or even if they had their suspicions they would sweep it under the rug to avoid scandal. His wife probably suspected she divorced him soon after and kept the 2 sons.
She kept her mouth shut probably to not let the sons find out the truth.
Fast forward 20 years Peterson marries Kathleen for the money she a golden goose bringing in 200k a year to finance his fancy lifestyle and support his deadbeat kids.
Once she told him her job was in jeopardy and the gravy train might end and she had 1.4m life insurance he figured she worth more dead than alive. He had gotten away with the Ratliff murder so he figured he could recreate that he gave her some wine made sure she took a valium to make her tipsy then he killed her and staged the scene. He probably had planned it for some time he didnt figure someone would bring up Ratliff and he probably didnt expect the Southern DA and jury to go after him on the homosexuality which Im sure the jury wasnt crazy about and may have influenced the verdict.