Patrick O'Hara, 72, told a court Dr Thomas Kwan, the son of his then partner, had left him a "shell of an individual".
In January, Kwan disguised himself as an NHS nurse to give a fake Covid booster jab he hoped would kill the pensioner.
The wealthy father of one may be handed a life term of up to 35 years after admitting attempted murder, having denied it when his trial began.
Everlasting
His aim was to be able to gain the funds from the sale of his mother's house upon her death as quickly as possible.
Retired environmental analyst Mr O'Hara was secretly injected with iodomethane.
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