Story here. Excerpt:

'A US father who bashed his mentally ill wife to death with a torch after she strangled their son and tried to kill their daughter has been jailed 30 years for manslaughter.

Christopher Smeltzer, 39, arrived at his New Hampshire home on November 7, 2010, to find his four-year-old son strangled to death and his seven-year-old daughter hanging off her bed with a scarf tied around her neck, Fox News reports.

His wife, Mara Pappalardo, was in the process of trying to kill herself, Rockingham Superior Court heard.

...

"I am mad and sad that my daddy killed my mommy and brother Mason," Mercey said on a tape recording played in court.

"Please keep him in jail for the rest of his life."

...

Smeltzer's charge was changed from second-degree manslaughter to manslaughter by provocation because of the traumatic scene he would have walked into.'