TAMPA -- Should you be concerned about the Seminole Heights killer, even if you don't live there? One retired FBI agent says you should be.

We talked to former FBI special agent Dave Couvertier about the four murders there. He says the suspect does meet the criteria for being a serial killer. He’s acting along, has killed more than two people. And it usually happens in separate locations.

People in Seminole Heights are obviously very concerned. But should people outside the neighborhood also keep an eye out?

“Absolutely,” said Couvertier. “What he’s doing right now, as we’ve seen in the past, he’s very comfortable in this location. But he’s probably looking in other locations outside this particular region. So everybody should be alert and everybody should be helping out.”

Statistically, killers usually live within one or two miles of the crime scenes, so while it’s likely the suspect knows someone or lives in Seminole Heights, Couvertier says it’s not a given.

One question that we had – with as much video as we have, how has the killer not been caught?

“It’s coming down to one thing -- just coming up with an ID,” said Couvertier. “Law enforcement has all the pieces to this situation, but they need one piece to this puzzle and that’s why they need a tipster to come forward and identify this individual.”

There's a $100,000 reward for information that leads to an arrest.

We’ll continue to follow all of the developments from Seminole Heights. Stay with 10News for the very latest on the killings.

PHOTOS: Victims in Seminole Heights killings

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