Inverness, Florida - The house is on Eden Drive, but Wednesday night it was no Garden of Eden. The peace of the neighborhood near Inverness was shattered by gunfire and sirens.

"We seen all the cops and the ambulance out there," said Maydell Ernsting who lives across the street.

According to the Citrus County Sheriff's Office, off-duty Deputy Gregory Entreken and his girlfriend (her name has not been released) were inside the home when 28-year-old Derrick Vaccianna broke in.

"He confronts both the deputy and the girlfriend inside and they get into a verbal confrontation and they had kind of a pushing, shoving match," said Gail Tierney, spokesperson for the Citrus Sheriff's Office.

Tierney says it was during that tussle that Entreken shot Vaccianna once in the chest. Vaccianna later died at the hospital.

The Florida Department of Law Enforcement is now investigating the shooting. A spokeswoman would not comment on the case, citing the ongoing probe.

However, this was not a random break in. Neighbors tell 10 News that Vaccianna also had a relationship with the woman at the house. He had lived there with her for months.

"I never had any issues with him; upstanding guy, always waving 'hi'," said one man who didn't want to be identified. He called the shooting "shocking".

Vaccianna was a sex offender on probation at the time of the shooting. In 2005, when he was 19, Vaccianna was convicted of lewd and lascivious conduct involving a 12-year-old girl. And that also raises concerns about his contact with the woman's two young daughters.

Greg Entreken is new to the Sheriff's Office. The 24-year-old joined the agency just last month after serving in Afghanistan with the Marines. He was following in his father Lee's footsteps, who is very well known in the law enforcement community. Greg Entreken has now been placed on paid administrative leave.

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