Police are not calling the suspect a serial killer because they can't determine whether the same person committed all the murders, Dugan said, adding that authorities are \"pretty convinced\" that the suspect was involved in at least Mitchell's and Felton's.

\"Someone has to know who this individual is,\" he said, citing the suspect's \"unique walk\" and \"unique posture.\"

\"PHOTO:
Jones, Octavio/Tampa Bay Times via AP
PHOTO: Members of the Tampa Police Department, Bureau of Alcohol, Tobacco, Firearms and Explosives and the Hillsborough County Sheriff's Office work the scene of a fatal shooting in the Seminole Heights neighborhood in Tampa, Fla., Nov. 14, 2017.
>

The suspect is striking \"under the cover of darkness\" against people who are alone and \"probably preoccupied,\" Dugan said. A motive is not yet known.

Felton was supposed to meet up with someone Tuesday when someone came from behind and shot him as he was crossing the street, Dugan said after the killing. Police responded to the scene within minutes and formed a perimeter eight blocks wide, but the suspect fled northeast from the area, Dugan said.

\"PHOTO:
Courtesy James Felton
PHOTO: Ronald Felton, 60, is the 4th person slain in a Tampa neighborhood amid search for apparent serial killer.
>

Investigators have received more than 450 tips since Felton's death on Tuesday and 2,300 tips in all, Dugan said. A reward for information leading to an arrest has increased to $91,000 he said.

\"Let's hope this motivates somebody with the strength and fortitude to step forward,\" he said, emphasizing that investigators need names rather than profiles or speculation in order to more easily eliminate possible suspects.

The first three victims were killed within 11 days in October. After Mitchell was killed on Oct. 9, the body of 32-year-old Monica Hoffa was found on Oct. 13, just half a mile from where Mitchell was killed, police said. Anthony Naiboa, 20, a man Dugan described as having \"mild autism,\" was killed on Oct. 19 after taking the wrong bus home from work.

If you're reading this and have info about the #SeminoleHeights murders we're pleading with you to contact @crimestopperstb pic.twitter.com/CGneg1Md2p

— TampaPD (@TampaPD) October 31, 2017

Dugan said he believes the community has rallied together and \"given a strong message to whoever is doing this,\" citing the weekslong gap between Naiboa's and Felton's deaths. Dugan encouraged Seminole Heights residents to continue to keep their porch lights on between 6 p.m. and 6 a.m. and to \"stick together\" when they are outside.

\"PHOTO:
ABC News
PHOTO: Tampa Police Department Interim Police Chief Brian Dugan said the person seen two surveillance videos is now considered a suspect.
>

Dugan has been experiencing a \"tremendous amount of anxiety\" since the killings began, he said.

\"I don't sleep at night. How could I?\" he said.

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