Dad-of-three Amarjit Singh Rai, 41, died after being slashed across his throat and then bludgeoned about his head by Fausto Graciano at a Birmingham street in front of horrified passers-by.
Graciano, 27, was jailed for life after admitting manslaughter on the grounds of diminished responsibility, Birmingham Mail reported.
Judge William Davis said: "Amarjit Rai was a successful businessman, a prominent member of his community, a loving husband and a good father. On top of all that he was a good friend to you.
He said it was likely Graciano would remain in a secure hospital for many years.
Gareth Walters, prosecuting at Birmingham Crown Court, said the victim owned companies including the Pushkar restaurant on Broad Street and Cafe Guzan in the Mailbox, as well as running a convenience store in Silver Birch Road, Kingshurst.
He was well known for his kindness said Walters, who added it was his willingness to help others which "tragically" led to his death.
But in April this year his Lithuanian girlfriend returned to her home country which appeared to have a "significant impact" on him, with colleagues saying he was acting in an abnormal way.
On May 1 Rai visited the defendant's home in a bid to help him through his troubles, the court heard. But Graciano started acting violently and smashed a laptop to pieces.
He carried out the fatal attack the following day in a passageway close to his flat in Gillott Road.
"It was a vicious attack involving the use of a knife, stabbing Mr Rai and attempted strangulation," Walters said.
Police were called to the address and Graciano was arrested at the scene. He was transferred to a secure mental health facility, after being deemed unfit for interview, before being brought back to police custody and charged.
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