Gurpreet Singh, aged 45, denied being responsible for the death of his wife Sarbjit Kaur at their house on Rookery Lane on February 16, 2018.
Prosecutors allege he killed his wife with the help of an unknown accomplice between 8.10am and 9.03am before he left for work in his car.
Singh, on trial at Birmingham Crown Court, told jurors he loved his wife and "she loved me" and said Mrs Kaur, 38, was still alive when he left.
More from the trial:
The defendant alleged Bikramjit Singh, the brother of his first wife Amandeep Kaur who died in India, was responsible for Mrs Kaur's murder, the trial heard.
A "nasty letter" had been sent to the defendant's children in October 2016 which the defendant believed Bikramjit Singh had sent, a judge was told.
Prosecutor Mr David Mason QC, who cross-examined Gurpreet Singh, said Bikramjit Singh and his wife had said they "loved the way Sarbjit looked after the children".
Mr Mason QC said Bikramjit Singh and his wife, who gave evidence to the court, said they would never want to "hurt these children" through the loss of Mrs Kaur.
He added if Gurpreet Singh's events were to believed he would have been the victim of a "terrible miscarriage of justice" to which Singh replied: "I'm the victim – I'm no murderer."
Jurors were shown footage capturing the movement outside of Singh's home on Rookery Lane and the mysterious figure, believed to be a woman, walking to the property.
Singh said he didn't know who the figure was and wasn't aware she was in the house, despite CCTV footage capturing her entering and then leaving the home around 50 minutes later.
The 45-year-old denied hiring the person to be his accomplice and denied she was his mistress, saying the question asked by Mr Mason QC was disrespectful to Mrs Kaur.