The sole survivor of a deadly lunch laced with toxic mushrooms tearfully confessed he felt only half alive following the fatal meal which killed his wife.

Ian Wilkinson read the first victim impact statement at a sentencing hearing for Erin Patterson at the Victoria state Supreme Court in Melbourne on Monday.

The killer, 50 will be sentenced September 8, on three counts of murder and one of attempted murder.

A jury convicted her in July of murdering Don and Gail Patterson and Gail's sister, Heather Wilkinson, with a lunch of beef Wellington pastries and foraged death cap mushrooms.

Patterson's estranged husband, Simon Patterson, was invited but did not attend the July 2023 lunch served to her parents-in-law and her estranged husband's aunt and uncle at her home.