Came across the following article last night (entirely coincidental). Laura Haverlin St. George died on 13 Dec 1890, Peter St. George two days later, 15 Dec 1890.
Murder and Suicide at Cadott
Eau Claire News | Eau Claire, Wisconsin | Monday, December 22, 1890
On Saturday, the 13th, inst., Mrs. Peter St. George, of Cadott, was found hanging dead from a clothes-line in the barn, and her husband was about loudly bewailing her "suicide," as he termed it. Marks about her head and face showed plainly, however, that she had been killed before being suspended, and the officers kept a close watch on St. George, who evidently became alarmed and cut his throat from ear to ear, his body being found Monday night in his bedroom after life was extinct.
The coroner's jury found in accordance with the facts stated above. The little six-year-old daughter of the couple said her father and mother quarreled before daylight Sunday morning, and that her father struck and choked her mother and then dragged her out.
St. George was an old soldier, and Mrs. St. George was about 35 years his junior. They have resided at Cadott about a year and are known to have had considerable trouble for some time.