APOPKA, Fla. -

Apopka police say the man accused of opening fire during an Easter party was on private GPS monitoring at the time of the shooting.

Police said the victim was critically injured and the search is ongoing for the gunman, 33-year-old Wilfred Gregory, who was not found after a standoff at a nearby home.

Gregory was on GPS monitoring at the time of the shooting through a private company called Court Programs of Central Florida Inc. out of Gulfport, Miss., for a domestic dispute, police said.

The head of the company, only identified as Mr. Aponte, was questioned by police who said he may have known where the device was located and led police to the wrong address to find it while picking it up himself.

Aponte told police that Gregory cut the device off around 6:50 p.m. and that it was somewhere near 1301 Martin Road. He may be charged in the case, according to police.

Police are supposed to be alerted immediately so they can protect the domestic violence victim but the company waited six hours before notifying police and never turned in the device.

The victim, whose name has not been released, was taken to Orlando Regional Medical Center with wounds to his torso and head.

The residence is close to Alonzo Williams Park on Hawthorne Avenue, where the Easter party originated, said deputies, who added that there were hundreds of people in the area when a fight broke out.

"He shot him, he fell, he got up and the gun jammed and he shot him in the head," said James Griffin, who witnessed the incident.

After the shooting, deputies tracked Gregory to a nearby home  on 10th Street, but he was not located after an hours-long standoff in which a SWAT team used tear gas and flash grenades.

Deputies said Gregory is considered to be armed and dangerous.

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