A woman allegedly slipped sleeping tablets into her former partner's dinner and waited for him to fall asleep at her home in Sydney, Australia, before tying his hands and feet and cutting off his genitalia, The Daily Telegraph reported.

The man died in a northern Sydney hospital from his injuries, including stab wounds to his jaw and leg.

Police said Xian Peng, 48, had returned to the Sydney suburb of North Ryde from China for a visit and was at the home of his former partner Jian Chen on Tuesday night.

Police allege Chen served her ex soup laced with sleeping tablets.

Peng then fell asleep on the couch where he was tied up before allegedly having his penis severed and being stabbed a number of times.

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