Mentally ill teenager killed grandmother in arson attack ‘after arguing with his dad’

A TEENAGER killed his grandmother in an arson attack on her home.

Chanatorn Crog, 19, started the blaze hours after police had been called to the house as the teen with his dad, a court heard.

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Cops said they left as no defenses had been committed.

But at 6.30am the next day, December 11, 2020, smoke was seen coming from the Norwich house.

Fire crews found Vera Croghan, 89, dead in an upstairs bedroom.

Tests later found that the retired East Anglia University lecturer in Swedish died of smoke inhalation.

Her grandson — also known as Marco and who suffers from paranoid schizophrenia — was detained under the Mental Health Act.

Yesterday he admitted manslaughter by diminished responsibility and arson at Norwich crown court.

He will be on April 14.