A delivery driver has pleaded guilty to stabbing his stepdad’s 80-year-old father to death with a steak knife in a row over his inheritance.

Mark Robinson, 35, knifed widower Albert Wright in his home in Trelawney Road, Hainault “in order to inflict suffering” on his victim’s son David, who he described as a “gold-digger”.

David Wright had married Robinson’s mother just three months before her death from liver disease, and her son held him “at least partly responsible”, the Old Bailey heard.

Robinson harboured “strongly negative feelings” towards him after he inherited the bulk of her estate, including a house in Borehamwood, Hertfordshire and lucrative pension funds.

He had initially set out to attack David, but changed his plans when his intended victim was not at home.

Robinson later told police: “I wanna stick it to him and if he has to live the rest of his life without his dad then so be it.”

Robinson admitted murder when he appeared in court today. He will be sentenced on Friday.

Mr Wright was stabbed around half a dozen times to the neck and chest at his home on February 25.

Nearby CCTV cameras caught Robinson entering the house at 6.34pm and leaving just two minutes later.

But the body was not discovered until David, who had been living with his father since the death of his wife in September 2009, returned from drinking with friends at around 11.30pm.

The defendant attacked the deceased almost immediately after he answered the door and did not exchange words with him, said Roger Smart, prosecuting.

He said: “The deceased struggled, causing the defendant to suffer scratches to his face and hands.

“The deceased’s body ended up on the kitchen floor.”

Robinson, of Green Court, Green Close, Luton, admitted murder.