Four days after an inmate suspected in the death of a prison official escaped a Tennessee correctional facility, state officials are urging residents to remain vigilant as the manhunt continues.

Curtis Ray Watson, 44, went missing from West Tennessee State Penitentiary Wednesday morning after Debra Johnson, a corrections administrator at the prison, was found dead.

Saturday afternoon, TBI said it had recieved 369 tips but no credible sighting has been reported. TBI officials believe Watson could still be in the area near where he escaped from and have increased the reward money being offered for the capture and conviction of Watson to $57,000.

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Officials also released new photos of tattoos that could be used to identify Watson. TBI also said he had a circular tattoo on the left side of his neck and that they were working to get a clear image of that tattoo.

Watson was serving a 15-year sentence for an especially aggravated kidnapping charge at the West Tennessee State Penitentiary in Henning when he escaped. Henning is about 60 miles north of Memphis.

On Thursday, the Tennessee Bureau of Investigation announced that they secured warrants against Watson on first-degree murder, especially aggravated battery, and aggravated sexual battery charges.

Where was Curtis Watson last spotted?

TBI said Thursday there have been no confirmed sightings of Watson, despite numerous reports across the state.

TBI Director David Rausch also said Thursday the agency has received over 75 tips placing Watson across Tennessee and in other states.

"We are following up on every tip we receive. The ones we feel are most credible we are checking them first," Rausch said.

In a news conference Thursday, Rausch advised people in the region to check their property for things that are out of place, check security and trail cameras and check on their neighbors.

"He could be anywhere," Rausch said.

Officials said Watson worked on the grounds as a farm laborer. A tractor was discovered about a mile from the prison.

In a press conference Friday, TBI spokesperson Keli McAlister said law enforcement agencies have still made "no credible" sightings of Watson. Tipton County, Memphis police and Collierville police are assisting with other law enforcement in the manhunt.

They received a total of 250 tips, McAlister said.

Where could he be going?

TBI showed a map of the search area as they held a press conference about Watson, an inmate who escaped from the West Tennessee State Penitentiary.

Watson's sentence was connected to a Henry County conviction from 2013.

Henry County Sheriff Monte Belew urged the community to be aware of the possibility Watson would return to the area, which is approximately 100 miles northeast of the prison.

"The suspect does have ties to the community. We are urging our citizens to have a heightened awareness and use caution," Belew said.

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What you need to know

Watson's weight is between 180-200 pounds and he stands 5-foot-11. Authorities have distributed several photos of Watson, and his tattoos, to help the public identify him.

The reward for information leading to his capture and conviction has grown to $57,000.

TBI said in a social media post that Watson "should be considered extremely dangerous."

TBI asks anyone with information on Watson’s whereabouts should call 911 or 1-800-TBI-FIND.