A jury deliberated for less than four hours before convicting Kashif Parvaiz of scheming with his girlfriend to kill his wife and make it look like a random attack.
The August 2011 shooting occurred while Parvaiz and his wife, 27-year-old Nazish Noorani, walked with their son near her family's home in a New Jersey suburb about 50 kilometres from New York that is home to a large Pakistani-American population.
Noorani was killed, Parvaiz was wounded and the boy was unharmed. The couple's other son was with family members in the house.
The victim's sister, Lubna Choudhry, cried in the hallway in the arms of her brother, Kaleem Norrani, after the verdict was read. The family did not immediately comment.
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Prosecutors said during the three-week trial that Parvaiz emailed two black magic companies asking if they could come up with a way to make his wife leave him, kill herself or disappear. They said he paid at least USD 4,500 for spells and prayers from the company.
Stephen faces a minimum of 30 years in prison, but has yet to be sentenced.