TUCSON, Ariz. - A Tucson man stabbed his wife to death with a pocket knife in front of his 9-month-old baby when the woman was packing bags, trying to leave the home with their child, according to court documents.

According to police, Kenneth Nelson, 43, told detectives his wife told him in February she wanted a divorce. On May 15, she texted Nelson saying she was packing her things, taking the baby and going to a hotel.

That's when Nelson came home, took a pocket knife out of his pocket and cut her throat and stabbed her multiple times, court documents say.

Nelson called his sister and told her he killed his wife and then sent her a picture of his wife on the ground in blood. His sister then called police, according to court docs.

When police arrived, Nelson had blood on his clothes and arms and legs. He allegedly told police, "I used pocket knives, it was the sound. I had to keep going." Court docs also say he told police, "It wasn't as satisfying as I thought."

The 9-month-old baby was found in a playpen unharmed. 

Nelson and his wife, whose name has not been released, have been married for nearly seven years, he told police. 

Nelson faces domestic violence and first-degree murder charges.