Ronald Felton, 60, is the latest person to be murdered in the Seminole Heights neighborhood in Tampa, Florida, over the space of two weeks.
Police believe the four killings, none of which involved a robbery or other obvious motive, may be related.
A makeshift memorial for shooting victim Anthony Naiboa sits on a sidewalk in the Seminole Heights section of Tampa, Fla., Tuesday, Oct. 24, 2017.
"Right now we are treating it as though it is related, until we can rule otherwise", Brian Dugan, acting police chief in the city on Florida's Gulf Coast, told a press conference.
Tampa police said the took the wrong bus home when he was shot to death.
At the same news conference, Tampa Mayor Bob Buckhorn added: "This has got to stop".
"We want to talk with as many people as we can, we don't think whoever did this has gone very far at this point", Hegarty said.
As police scoured the area for a suspect, residents were told to lock their doors and stay in place. Investigators believe he's 6 feet to 6 feet 2 inches tall, with a thin build.
Police say they believe the shooter lives in the neighborhood and are urging residents to stay indoors until the scene is cleared.More news: Mattel's hijab-wearing Barbie replica of Olympian Ibtihaj Muhammad has arrived
Eight schools in Seminole Heights were placed on lock-in as a precautionary measure for part of the morning on Tuesday. Drivers are asked to find another route.
Benjamin Mitchell, 22, was shot dead at a bus stop October 9; the body of Monica Hoffa, 32, was found in an empty lot nearby four days later; and Anthony Naiboa, 20, was shot October 19 only blocks away from the first killing.
Three people were slain in Seminole Heights last month in a 10-day span.
On Oct. 13, victim Monica Hoffa, 32, was found in a vacant lot in the 1000 block of New Orleans Avenue.
On Oct. 19, victim Anthony Naiboa, 20, was walking north on 15th Street in the area of Wilder Avenue when he was shot and killed. She was shot and killed. The description appears to match a person of interest that was captured on surveillance video released by police late last month. In a security video taken moments after Benjamin Mitchell became the first victim on October 9, the suspect is running from the scene. There is a $35,000 reward for any information leading to his arrest.
This is a breaking news story.
Ronald Felton was shot and killed outside of his church in Seminole Heights.
"It makes me feel safer that they've moved the bus stop but it still it gets dark and tonight- knowing he's still on the street-they haven't caught this man".