Investigators in Daytona Beach, Fla., are testing the DNA of a new person of interest -- a longtime volunteer at a homeless shelter -- in connection with a search for a serial killer, Local 6 News has learned.

Detectives said two of the serial killer's victims apparently visited the Volusia County Homeless Coalition where person of interest David Lindsay volunteered.

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IMAGES: Victim Photos
IMAGES: Prostitutes Hunt Serial Killer

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An investigation found that Lindsay served eight years in jail for killing his wife and was wanted for strangling an elderly man in Illinois, Local 6 News reported.

Police have not called Lindsay a suspect in the deaths of Laquetta Gunther, Julie Green and Iwana Patton. However, investigators are testing his DNA to see if it matches samples taken from the scenes where the bodies were found, according to the report.

"Obviously, for what he was arrested for and the area he has been in for the last couple of years, we are interested to see what he has been up to but again, at most, he is just a person of interest," an investigator told Local 6 reporter Tarik Minor on Tuesday.

Gunther's body was found in an alley on Dec. 26. Green's body was discovered Jan. 14 on a dirt road at a construction site, while Patton was found on a dirt road Feb. 24.

The three women are believed to have entered the killer's vehicle before they were found shot to death.

Sources told Local 6 News in an earlier report that all three victims were shot at close range by someone who likely frequents the streets.

Anyone with information concerning the homicides is urged to call Crimeline at (800) 423-TIPS.

Watch Local 6 News for more on this story.