A fourth person was found shot to death early Tuesday in a Florida neighborhood plagued by a string of deadly shootings that cops suspect were carried out by a serial killer, according to a report.

Tampa police have asked Seminole Heights residents to hunker down in their homes while they search for the killer, the Bradenton Herald reported.

“This has to stop. We will hunt this person down until we find them,” Tampa Mayor Bob Buckhorn said at a press conference. “We need to catch this killer before we have to notify one more family that their loved one is dead.”

The victim was identified as Ronald Felton, 60, who was crossing the street when a tall, thin man wearing a black baseball cap shot him in the back.

A witness told police that if he’d been there just seconds earlier, he would have been able to stop the shooting.

Police also asked gun-owning residents to check their homes and make sure their firearms were still there.

In October, three people were shot and killed within five days of each other in the same neighborhood, and the cases remain unsolved.

The most recent shooting occurred about four blocks from where the second victim was slain on Oct. 11 and cops believe the killer may live in the area.

The search for the serial shooter has intensified, with police increasing their presence in the neighborhood and contacting the FBI.

Buckhorn is also intent on catching the “son of a b—“ killer, telling cops last month to “bring his head to me.”