More detail here. Sounds like the spear a decoration and was at the foot of the bed maybe leaning precariously against the bed post or if it was an ornament was hanging on a wall over the bed and got knocked off or grabbed onto and pulled off. She had been drinking and he probably wasn’t too sober himself. Their guest, her friend, was in the other room after they’d all come back in from having some drinks. His wife wanted and he got in an argument he says because she wanted to stay in the bedroom on the bed and he wanted her to go with him back to the living room with the guest was waiting. The guest didnt see anything but heard an argument and heard the wife say ‘do you want me to make a scene?’ To get his wife up, he says he tried dragging her off the bed by grabbing her by the ankles with his back turned to her and in the process dragged her off the end of the bed where the spear was, unless she had it as part of making a scene, or tried to grab onto it to stop him from dragging her off the bed. Not sure if she was laying on her belly or her back but sounds like she was on her back and the blade went in at a sharp angle under the ribs and through to her sternum.
So - who on earth keeps a spear with a 12 inch blade in their bedroom? Spears are really difficult to use as a close-quarters weapon, so it’s really hard to imagine one that just happens to be nearby, pointed in the correct direction and yet ignored by everyone involved.
Probably lucky that I’m not on that jury.