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The Huntsville Times, Sarah Cole, Associated Press
Deputies respond to a call at the home just over the state line in Fayetteville, Tenn., Monday, Oct. 22, 2012. Police say the deaths of three young women and a toddler in two separate homes in Lincoln County could be related and they are searching for a man they believe to be armed and dangerous.

FAYETTEVILLE, Tenn. — Tennessee and Alabama investigators are working together to try to identify a suspect in a series of killings that left six people dead in the two states.

Tennessee Bureau of Investigation spokeswoman Kristin Helm said Wednesday that investigators are following evidence from four crime scenes that they hope will lead to an arrest or allow them to issue an alert to the public for a suspect.

Helm said the investigation has found that one of those who died, Warren Vincent Crutcher, knew the other victims.

Three women and a toddler were killed at two homes in Fayetteville while Pope and Crutcher were found dead in Madison County, Ala.

Helm said Crutcher had former or current relationships with the three women and was an acquaintance of the other male victim. She said all of those cases are homicides.