Police identified the officer Saturday evening.
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According to police, Officer Andrew Hall was questioning a homeless man standing in the middle of Sycamore Valley Road Thursday.
Officials say the man, identified tonight 32-year-old Tyrell Wilson, pulled out a knife and advanced toward Officer Hall.
That's when Hall fired his weapon.
Wilson remains in critical condition at the hospital
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Hall, who has been an officer for more than seven years,is on paid administrative leave, which is department policy.
But we are also learning that Hall was involved in a deadly shooting in November 2018.
Hall shot and killed 33-year-old Laudemer Arboleda of Newark, who police say led officers on a pursuit, and steered his vehicle toward an officer.
Witnesses at the time disputed that claim from police.