FBI agents joined Tampa, Florida, police and the Hillsborough County Sheriff’s Office in conducting door-to-door searches on November 14, as the manhunt continued for a suspected serial killer, the Tampa Bay Times reported.

The searches were prompted by the killing of a fourth person in the Seminole Heights area on Tuesday morning. Sixty-year-old Ronald Felton was shot outside the food bank where he volunteered, police said.

It follows the killings of three people in the area over an 11-day period in October.

This video was recorded at the home of Aaron Stubblefield on Tuesday afternoon. He told Storyful that he was at work at the time of the search and his roommate answered the door. The agents searched his home for just under five minutes, he said. Credit: Facebook/Aaron Stubblefield via Storyful