The 35-year-old, who additionally conceded three charges of making foul photos of a kid, was imprisoned for life with a base term of 23 years.
Parkin said he had expected to murder himself yet rather “snapped” and turned the blade on his better half.
Witnesses heard him say: “I require the police, I’ve quite recently murdered my better half,” the court was told.
While in authority, Parkin additionally stated: “She was so dismal when she discovered what I truly am.
“We would part. She stated, ‘don’t execute yourself,’ and I ought to have done that. I ought to have executed myself.
“There’s some kind of problem with me.”
Police found proof of prepping on Parkin’s cell phone and looks for tyke mishandle on his PC.
Mrs Parkin instructed at West Boldon Primary School where she was depicted as “very regarded”.