FORENSIC evidence pointed to David Hill being his mother-in-law and business partner's killer, a jury heard.
Market trader Hill, 48, denies murder. He is alleged to have bludgeoned 73-year-old Molly Wright to death at her Castleford bungalow.
Forensic scientist Samantha Warna told Leeds Crown Court there was evidence of blood spattering on Hill's training shoes, jeans and denim jacket.
She said: "Because of the distribution and condition of the blood, in my opinion the findings were in keeping with David Hill having repeatedly struck Molly Wright."
Prosecutor, Nicholas Campbell asked her where she believed Hill would have been when Mrs Wright was attacked on the afternoon of September 27, 2006.
She replied: "He would have to be very close by. No more than a metre away on the basis of the size of blood spots seen on his clothing."
Miss Warna went on to tell the jury: "I also concluded that the findings were indicative of the incident starting in or close to the living room and that it continued and culminated in the kitchen.
"I was of the opinion she was struck while standing near the breakfast bar and again while on her knees or stooping near the sink, ovens and fridge and finally while she was lying on the kitchen floor with her head against the fridge."
Father-of-two Hill told police he found Mrs Wright lying on her kitchen floor and became covered in her blood trying to revive her and from cradling her.
Miss Warna said: "On the basis of the information provided, I'm of the opinion that the scientific findings cannot be accounted for by David Hill's version of events."
She said Mrs Wright was struck at least eight times on the head with a heavy curved weapon, fracturing her skull.
The prosecution claim Hill, of Lakeside Meadows, Pontefract, was 20,000 in debt and lost his temper after Mrs Wright found he was taking money from a joint account for the greetings cards and toy stall they ran in Castleford Market.