Additional District and Sessions Judge, Rajinder Singh Rai, held Neki Nalwa, her alleged paramour Himmat Singh Brandy and accomplice Paramveer Singh guilty of the murder.
Quantum of sentence will be announced on Monday.
It was on December 4, 2005, when Sukhwinderjit Singh, an engineer in his late 20s, was shot dead while he was taking a walk with his wife near their residence in Sector 69.
Victim's aged parents had registered the case and fought a sustained battle for justice.
Ever since they were arrested on December 7, 2005, Neki along with Brandy, both in their early 30s, had been lodged in Patiala Central Jail.
However, Paramveer, who was accused of providing cartridge used in the crime, was out on bail.
Though she had been claiming innocence, Neki had been denied bail repeatedly by the High Court as well as the sessions court.
